Almost immediately after receiving a positive pregnancy test result, women think about when they will give birth. This date is important as a guide, a direction that will help you better understand how much is left, as well as plan things and prepare for the birth of the baby. The expected date of delivery is also important for doctors. There are several ways to calculate it - by last menstruation, by date of conception, by ovulation. How to do this in practice, this article will tell.

PDR - what is it and why count?

It is customary to consider the estimated date of birth not only so that future parents can check with the "Saints" and choose a name for the child, as well as plan father's vacation. PDR is an important guide that is necessary for the attending physician and the woman herself to track the dynamics of pregnancy, planning the method and method of delivery.

The estimated due date is not accurate, so don't treat it as your baby's due date. When the day of childbirth comes, medicine, alas, cannot predict in advance. Childbirth is a very complex and multi-stage physiological and biochemical process, the beginning of which requires the complete readiness of both the mother and the fetus. And you need to calculate the DA only in order to know the approximate time period in which the day of delivery will happen.

Normally, full-term babies are born between 38 and 42 weeks of pregnancy inclusive. The due date may fall on any of the days during this time. Only every twentieth baby is born strictly in the PDD, the rest prefer to surprise their parents with their birth either earlier or later than the date indicated on the mother's exchange card as the PDD.

Counting Method

You can make the necessary calculation in two ways - on your own with a calculator and a calendar, or using a pregnancy calculator that works online. The calculator will help save time, because it allows you to calculate the required date in seconds. The calculation algorithm is the same both for independent calculations and when using a calculator. It is based on the obstetric method of calculating the gestational age.

This means that it is customary to consider the DA not from any day, but from the first day of the last menstruation. Such a calculation is considered the most correct method. The fact is that the day of the beginning of the last menstruation before the onset of the “interesting situation” is the only precisely known date, and it is simply impossible to determine all the rest with an accuracy of up to a day. The gestational age according to obstetric standards is calculated from the first day of menstruation, considering this day as the first day of pregnancy.

• 9 calendar months are added to the day of the beginning of the last menstruation and 7 days are subtracted;
• from the day of the beginning of the last menstruation, subtract 3 months and add 7 days;
• 280 days are added to the day of the beginning of the last menstruation (the average duration of gestation in humans).

With the help of an online calculator, the calculation does not take much time. A woman simply enters the day the last menstruation began and receives free information about how many days are left before childbirth, what date the end of the 40th week falls on (this is the PDR), how long the woman is now (up to a week and a day). Also, the calculator will facilitate the task of finding information about the term - it will give useful links to articles about the development of the baby, remind you when you need to go to a consultation, what tests to take at what time, when to come to the first or second prenatal screening.

How to calculate the date of birth by the date of conception is a difficult question. The fact is that it is extremely difficult to establish the exact date of conception, even if a woman knows exactly what sexual intercourse led to the birth of a new life. Fertilization itself takes place only during the ovulatory phase. It does not last long - from 24 to 36 hours after the release of the egg. It is this life expectancy that is given to female germ cells.

Spermatozoa are more resistant and hardy and can exist in the genital tract of a woman for up to 3-5 days, and therefore, after the egg leaves the follicle on the surface of the ovary, it can be fertilized like those germ cells that were already in the genital tract after the act for 3 -4 days before ovulation, and sperm from a "fresh batch".

Ovulation itself is also a very unstable date, it can happen a few days earlier or later, since this process is directly dependent on the endocrine background.

If a woman believes that she knows the date of conception, because she remembers the day when she had intercourse, this does not mean at all that fertilization itself occurred on that day. For this reason, the date of birth is not calculated from the date of conception. But by the date of ovulation (if you know it for sure), you can also make a calculation - 266 days are added to it. This allows you to find out what day the expected day of delivery falls on.

Neither doctors nor calculators use such a calculation system because of its high error and inaccuracy.

Irregular cycle and IVF

It is quite difficult to use a calculator and independent calculations if a woman has such an irregular cycle that she simply does not remember when her last period began. Irregular cycles can be different. If they appear with different cycle lengths (then 28, then 32 days), this will not affect the calculations, since there is a date for the last menstruation, the rest can be calculated without problems.

If the date is unknown, then in the early stages you need to do Ultrasound to determine gestational age. Only up to the 10th week of pregnancy can it be determined quite with great accuracy. Before this period, embryogenesis processes take place, when organs, tissues, systems are laid in the baby, and the growth of different embryos at this period proceeds at approximately the same pace.

By the end of the first trimester, babies in the womb begin to grow in different ways: some are larger, others are small. This is influenced by the genetic program received by the baby from the parents, or simply by heredity. Determining the term by the size of the fetus becomes difficult.

If the desired pregnancy has occurred in the IVF treatment protocol, general calculators and calculation methods for pregnant women are also not suitable. For artificial insemination, a woman is provoked by drug superovulation, and then several mature eggs are taken from several follicles at once by the method of follicular puncture. Fertilization with the sperm of the husband or donor occurs in the laboratory. After a few days, the embryos are transferred to the patient's uterus.

After 14 and 21 days after that, a woman can visit an ultrasound specialist to confirm or deny the fact of pregnancy. In this case, nothing can be calculated from conception either, because the conception was in the laboratory. It all depends on how big the embryos were transferred when they were implanted.

There are special calculators that help calculate the date of birth and the current period for women after IVF. They need to indicate the date of the embryo transfer, as well as the age of the embryos at the time of the transfer (three days, four days, five days). As a result, they receive a calculation in which the gestational age is indicated in the obstetric period, and the PDR, like everyone else, falls at the end of the 40th week of pregnancy.

What should be taken into account?

When determining the term of childbirth by any of the methods described above, a woman must remember that there are a number of personal characteristics of the body that can also affect the PDR. The calculations, of course, will remain the same, no adjustments need to be made to them, but you should be aware that in women with a short menstrual cycle, childbirth usually occurs earlier than the expected date. With a long cycle (more than 33 days), there is a high probability that the pregnancy is also prolonged to 42 weeks or more.

As close as possible to the expected day of delivery, women usually give birth with an established cycle, lasting from 28 to 30 days. This is the classic obstetric standard for the duration of the menstrual cycle.

If a woman is expecting her first child, then childbirth most often also approaches the date defined as the due date. And with repeated births, it is more likely that the child will want to be born earlier than the date indicated on the mother's exchange card.

​​​​​​Multiple pregnancies usually end in delivery before the due date. Large children are not in a hurry to be born, so childbirth may begin later than the expected date.

Relative confidence in the timing can only be in women who, for medical reasons, are scheduled for a planned caesarean section. His term is appointed for 39 full weeks, if there are no circumstances and reasons for an earlier delivery. In this case, the expectant mother can choose the birthday of her child on her own within the specified time period, doctors give this opportunity, offering a choice of any day between 39 and 40 weeks.

See also:

Express tour: pregnancy by week

Pregnancy women lasts 280 days or 40 weeks, which is 9 months. This difficult path to the meeting of mother and baby is usually divided into trimesters, each a week which has its own characteristics and characteristics. Each trimester consists of three months.

First trimester: 1-13 weeks

At the "start" after conception, an embryo is formed, but the signs are poorly felt by the mother. Details:

• Week 1 For pregnancy to occur, it is necessary to attach an egg that travels through the tubes to the wall of the uterus. The expectant mother feels the world deeper, becomes more thoughtful. Many women at this stage feel symptoms, as before menstruation - pulling the lower back, aching in the stomach. To determine the gestational age in weeks and calculate the due date from the last menstrual days, use our pregnancy calculator. Try not to drink pills and eat right;
• 2 weeks- a follicle matures in the ovaries during ovulation, then it bursts, the egg comes out, the breast becomes sensitive, irritability increases slightly, but libido also increases. No saunas and baths during this period! No weight lifting! Only exercising, swimming, not smoking, orange juices and green vegetables rich in folic acid, which helps to absorb iron! Taste habits change, you often want to go to the toilet, pressure decreases;
• 3 week- the embryo lives in the mother's body, the egg is fertilized by the sperm, divides, after 2.5 weeks it reaches the uterus, which becomes loose by the end of this period. Nothing prevents the egg from attaching securely to the mucous membrane. The metabolism changes, the mammary glands coarsen. It is necessary to replace sweets with nuts, eat foods rich in calcium, protein, folic acid, iron;
• 4 week- Mom detects a delay in menstruation, nausea, malaise may appear. Hormones released during pregnancy can be seen already in the urine in a laboratory analysis. The internal organs are laid in the embryo, the mother needs vitamins;
• 5 week- the uterus thickens, the baby looks like a tadpole, but its eyes and nostrils are already forming, there is already a heart, the base of the skeleton is formed. The baby receives nourishment and oxygen from the mother's blood. The woman's ovaries actively release progesterone, the mother's immunity decreases. In 7 days, the embryo grows up to half a centimeter;
• 6 week- the formation of a fetal bladder is underway, protecting the embryo from any troubles, the nervous and circulatory systems are developing hourly. There are processes of creation of the brain, liver, respiratory organs, pancreas. The baby grows up to 1.3 cm;
• 7 week- the size of the head of the embryo reaches 0.8 cm. The visual system is formed, the neural tubes thicken, the upper part of the intestine secretes the esophagus, stomach and pharynx, the bladder, rectum are visible under the lower part, in male embryos - the prostate. In a woman, the skin of the face can become oily during this period, as in a teenager. Hormonal changes can cause itching. In case of any trouble, it is better to consult a doctor for advice;
• 8 week- the nervous system receives maximum development, the medulla oblongata is ready for work, the spinal cord and brain have already fully formed, the eyes are still without eyelids, there is a nose, fingers and elbow joints appear on the handles. Mothers should beware of infections;
• 9 week- the third month begins, the face acquires human features, the eyelids form, a sucking reflex appears, the circulatory system circulates inside the tiny organism, the heart acquires three chambers, the bronchi branch. Mommy's breasts are growing so much that the next bra number is required. The uterus increases, the ligaments stretch, pulling sensations in the lower abdomen for this period are the norm;
• 10 week- A 5-centimeter embryo is already considered a fetus, on ultrasound you can see its gender. His nervous system was divided into central and peripheral, the hemispheres of the brain become more independent. An enlarged uterus is groped even with hands, you constantly want to go to the toilet;
• 11 week- the baby's body gradually straightens, reaches 5.9 cm, the legs begin to actively catch up with the arms, an iris forms near the eyes, lymphocytes appear. The mother's kidneys experience a double load, removing metabolic products for two;
• 12 week- A 50-gram fetus has grown to more than 7 centimeters, the movement of the chest during breathing is noticeable, the heart beats more than 150 beats per minute, milk teeth, vocal cords, and diaphragm are formed. Mothers need to get enough sleep, exercise, keep calm;
• 13 week- the placenta has reached 16 mm, becoming a reliable protection for the baby. From this point on, the body will even withstand antibiotics, if necessary. Bones and ribs need calcium. Without subcutaneous fat, the skin looks wrinkled. Mom may experience constipation, lower blood pressure, and disturb the kidneys. It is important to eat right in order to gain no more than 11 kg for the entire pregnancy, for multiple pregnancy - no more than 17 kg;

Second trimester: 14-27 weeks

This is a mildly flowing period of bearing a baby, during which the mother's body is completely ready to work for two, despite weight gain, rounding of shapes, and the appearance of a belly. The embryo has fully formed internal organs and systems, the child moves its limbs, sucks its finger, and the feeling of its movements gives the mother endless delight. More:

• 14 week- the baby maintains the chemical composition of the amniotic fluid, excreting urine in them up to several times a day. The ovaries in girls and the prostate in boys are improved. The lack of vitamins affects the well-being of the mother. She has a feeling that there is not enough air. It is worth eating less potatoes and legumes. You may be allergic to strawberries, peaches, oranges;
• 15 week- the heart of the crumbs overtakes about 23 liters of blood, convolutions form in the brain, the bone marrow develops, the intestines form the original feces, the amount of amniotic fluid increases. You can talk to your baby! The height of the uterus reaches 14 cm. The woman begins to bloom;
• 16 week- the date of the baby's movement helps to more accurately set the date of delivery, he actively moves every 10 minutes. He opens his eyes for the first time. Fetal movement may appear by the 20th week. Charging and the right menu improve the mother's condition;
• 17 week- the weight of the fetus exceeds 100 g, and the height reaches 12 cm. He and his mother need calcium, healthy food, since the body type is laid. A woman feels pressure in the stomach, liver. You have to eat many times a day in small portions so that the stomach has time to cope. Sometimes there are cramps in the legs due to a lack of B vitamins, magnesium, calcium;
• 18 week- the height of a small child is 13 cm, weight - 170 g, head diameter - almost 4 cm, fingers become proportional, foot length reaches 2.5 cm. Mothers rejoice, feeling his movements. At this time, there is a high probability of determining the sex of the baby on an ultrasound scan. The ideal weekly weight gain for a mom is 500 g. To reduce swelling, you need to consume less salt;
• 19 week- the child reacts to screams, the volume of the voice, turns the head to the sound. Listen to pleasant music, do not quarrel with your family. A pattern is formed on children's palms. Shocks in the tummy become more distinct. Women do not always distinguish the movement of the fetus from the processes that occur in the intestines;
• 20 week- the endocrine system is formed, the parts of the brain are improving, the baby can swallow, has good hearing, its weight is about 290 g, its height is about 24 cm. Mom's waist disappears from the rounding of the tummy, the first stretch marks appear, a comfortable bra is required;
• 21 weeks- if a baby is suddenly born after this period, its ability to survive increases significantly. Systems and organs are formed, the stomach and chest, head grow, subcutaneous fat is formed, receptors on the tongue distinguish taste, the first leukocytes appear in his body. Requires a lot of protein and 4 times more carbohydrates;
• 22 week- the brain weighs 100 g, the height of the fetus is 28 cm, the weight is about 430 g, the mass of the heart increases, the ligaments and vertebrae are clearly visible. It is necessary to consider the baby's movements, since swelling can compress the blood vessels that carry food to the placenta;
• 23 week- alveoli are formed, the respiratory system develops. Mom needs to drink plenty of water, because plasma is made up of it. On the head of the child, a fluff is noticeable during ultrasound examination, muscles, spine, bones, aorta are clearly visible;
• 24 week- Gradually, the skin of the baby is smoothed out, due to the appearance of subcutaneous fatty tissue. The baby feels the emotions of the mother. The doctor listens to how the heart beats, whether the breast, tummy has grown, what is the diameter of the head;
• 25 week- the weight of the child is 680 g, height - 34 cm. The bone marrow is connected to blood formation. In order for the alveoli to function, surfactant accumulates in the lungs. The bottom of the mother's uterus has risen to 25 cm, legs get tired more often, pain in the lower back appears;
• 26 week- the baby has grown to 35 cm, gained more than 770 g, smells, reacts faster to voices. The diameter of the head is now 65.1 mm, the abdomen is 67.4 mm, and the chest is 65.8 mm. By this time, the woman puts things off, spares herself more;
• 27 week- bookmark the speed of reactions, metabolic processes. Mom needs to gain strength for the upcoming third of gestation. The period is characterized by frequent shortness of breath due to a feeling of lack of air.

Third trimester: 28 weeks to delivery

The most difficult stage for a mother is from 7 months to childbirth. It is accompanied by the active growth of the baby, preparing the child for independent existence. Details:

• 28 week- the baby is exactly 7 months old, you can determine whether he will be right-handed or left-handed. To do this, the ultrasound shows which handle he often reaches for his mouth. There is already enough surfactant in the lungs so that the alveoli do not stick together during the first breath;
• 29 week- the growth of the baby has reached 38 cm, the weight is more than 1 kg. In the lubricant, he only has a tummy and folds. He becomes cramped inside his mother, and the blood fully protects him from infections, but venous and arterial blood is still mixed. The daily portion of urine excreted is 500 g. Mom is on maternity leave at this time;
• 30 week- the chest of the crumbs grew to 77.4 mm, and the tummy - to 79.3 mm. The cerebral cortex is formed, the child begins to remember some sounds, sensations. Mom will have to visit the gynecologist weekly. Due to the increased pressure on the vessels during sleep, the hands go numb, the legs cramp. The ligaments become elastic, you can do light stretching workouts in the pelvic area;
• 31 weeks- The child's weekly weight gain is about 200 g. The child needs subcutaneous fat to keep warm. The pigment accumulates in the hair and the iris of the eyes. Sometimes the uterus rehearses childbirth, one-time contractions appear;
• 32 week- the baby weighs 1700 g, the body length is over 40 cm. If the placenta "gets old", the nutrition will be disturbed, and deviations will appear in development. By this period, the first hair appears. The mother produces vasopressin and oxytocin;
• 33 week- the child has to take the fetal position, because there is not enough space. The body reached 43 cm, the head - 8.2 cm, the tummy - 87.4 mm, the breast - 85 mm. The placenta copes with the function of protecting the baby from harmful factors and nourishes it through the blood;
• 34 week- the baby weighs 2.1 kg. The placenta produces hormones that cause lactation. Its thickness is 3.39 cm. It is important not to overdo it with the use of calcium in order to exclude birth injuries. It is necessary to continue to count the movements of the fetus - 4-6 movements are considered the norm;
• - childbirth is possible this week, but heredity determines a lot. The head is 1/4 of the body length, its diameter is 91 mm. Feet have been defined. The genitals and reflexes of the baby are developed. The placenta dries out, delivers nutrition worse. Mom is focused on the upcoming meeting with the baby;
• 39 week- the baby weighs 3.3 kg, height - 51.5 cm. Thanks to the fontanelles made of cartilage, the bones of the skull remain supple so that the child can pass through the birth canal. The baby will be able to distinguish objects at a distance of 30 cm from the eyes. The placenta ages and the fetus feels a lack of oxygen. Mom prepares things for the hospital and documents;
• 40 week- the child patiently waited for this hour, gained more than 3.5 kg, grew to 53 cm. The mother becomes anxious if childbirth does not occur. Before delivery, you often want to go to the toilet, the lower back aches, the cervix gradually opens, colostrum is released from the nipples.

If the birth did not occur at the 40th week, it does not matter. Resolution within 42 weeks is considered normal. It remains to trust nature. Only 10% of women in labor reach the 42nd week. Dopplerography and ultrasound are performed to assess the condition of the baby and mother. The main thing is to remain calm so as not to harm the health of mother and child.

"Cervix" in Latin means "cervix") or cervical canal. The cervix is ​​4 cm long and the width of the cervical canal is a maximum of 4 mm. The shape of the canal resembles a spindle, that is, its widest part is located in the center of the cervix, and the canal narrows up and down. This form ensures the preservation of the mucous plug, which is normally present in the cervical canal.

Description

This calculator will allow you to calculate what stage of pregnancy you are currently in, the date of future birth, the date of conception, and even the zodiac sign of the future baby and his zodiac animal according to the Eastern calendar. You can also determine the age of the fetus, its weight and height, and how much time is left before delivery. To do this, you need to enter the date of the first day of your last period and the length of your menstrual cycle. In addition, our calculator generates a very convenient and practical weekly pregnancy table. Using it, you can navigate which week of pregnancy you are currently in, as well as track the height and weight of your unborn child.

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DATE OF PREGNANCY Calculator

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For many women, the feeling of an impending or already begun pregnancy occurs before the test shows two strips - that is, even before the actual delay. Scientists cannot yet explain these true premonitions, however, the concept of the Early Pregnancy Factor has already been introduced into the scientific lexicon, which describes the chemical reactions of the mother's body in response to an accomplished conception after just a few hours. Currently, there are already tests for the detection of the hormone Early Factor in the female body, but due to the significantly expensive cost, these tests are not produced on an industrial scale.

On average, childbirth occurs 10 obstetric months (280 days) after pregnancy, when the baby is ready to be born. However, it should be noted that 280 days is the conditional number of days of bearing a child. All women's bodies are different, and all babies mature differently in their mother's tummy. Someone will need 280 days, and someone will be "already ready" in 240 days. Only 2% of newborns are born on a precisely calculated day. Most of the kids - two weeks earlier, or a few days later than the appointed time. The duration of pregnancy and childbirth is calculated based on the date of the beginning of the last menstruation.

If we take into account all the changes that happen to the baby almost every day during pregnancy, and especially the first trimester, then in general these processes can be compared with the birth of a new universe in terms of importance and complexity, in depth. Every day of the little crumbs inside you is not just a step, it is a huge breakthrough, a breakthrough. The birth of a new life, despite the scale of accomplishments, does not require any external efforts for itself .. everything happens under the cloak of secrecy. After all, the fact that conception has occurred, and the woman herself finds out only after some time. Thanks to modern technology, scientists have managed to study a little the great secret of birth - that with which EVERYTHING begins. Enter your data and flip through the pages of the calendar of development of human life throughout pregnancy. Believe me, amazing discoveries are waiting for you!

Calculator

This day requires special preparation. There are so many things to buy, cook, study a huge amount of literature, think through all possible scenarios. And it seems to us, women, that it would be a shame not to take into account something.

The whole pregnancy is not only a spiritual mood, but also quite material chores that should be carefully planned.

In a simple formula due date calculation the main component is the gestational age. Conception occurs most often on the days of ovulation, but not every woman knows when these very days come.

Everything is simple - exactly in the middle of the menstrual cycle, i.e. 12-16 days after the first day of the last menstruation.

For example, your last menstruation began on April 1, which means that the egg will go on its difficult path on April 12-16.

This due date calculation is suitable for women with an average menstrual cycle of 24-28 days. With deviations by day in one direction or another, the ovulation period also changes.

Let's assume that conception occurred in the middle of the last menstrual cycle. From this period of time, the long 40 weeks of your pregnancy begin.

Trying to calculate the due date by week

Some women mistakenly add 9 months and get a "supposed" secret date. This is not true, because pregnancy lasts a little longer - approximately 280 days or 40 weeks.

True, the doctor quickly eliminates this error and helps the patient decide with the help of a special calendar that any gynecologist has.

This calendar has the easiest counting system - from the first day of the last menstruation you need to subtract 3 months (April 1 minus 3 months = January 1), then you need to add 7 days to the resulting date (1 + 7 = 8), the result is the estimated date childbirth, which your gynecologist will enter on the card.

The second calculation method is to add 280 days to the first day of the menstrual cycle.

But you can’t rely only on these calculation systems, because for some, a full-term pregnancy can last 38 weeks, while for others - 42, all this is within the normal range.

Multiple pregnancy, as a rule, ends earlier than the date calculated by the doctor.

How to correctly calculate the term of childbirth by movements. Folk omens

To determine the term of childbirth, you can use a folk omen, which for many centuries, even before the development of medicine, helped expectant mothers.

Exactly in the middle of pregnancy, primiparous women for the first time feel the movements of their baby - this significant event occurs, as a rule, at the 20th week.

Multiparous mothers identify tremors as early as 18 weeks. the walls of the uterus after childbirth become thinner, and therefore more sensitive, therefore, the second / third / fourth time intrauterine movements are perceived better.

By the time of the onset of intrauterine movements, you need to add 20 and 22 weeks for the first and subsequent pregnancies, respectively.

But this method is not very accurate either, because girls with different builds feel tremors at different weeks, a thin woman feels movements inside herself already at 15-16 weeks, and a denser woman at 21-22 weeks.

It is worth adding that not all expectant mothers can immediately correctly evaluate incomprehensible movements inside themselves - some confuse this action with an intestinal disorder, sorry, or a movement of the abdominal muscles (a weak cramp).

You can also determine the approaching birth already in the last trimester - by lowering the tummy. This process makes pregnant women feel a little better and takes place 2-4 weeks before delivery.

Calculate due date by ultrasound

Another method for assessing the term of childbirth is computer diagnostics, or more simply, ultrasound. In the early stages (up to 12 weeks), ultrasound can accurately determine the day of conception, based on the size of the head and torso of the embryo.

Up to a certain point (approximately 3-4 months of pregnancy), all babies develop in the same way, after which the genetic predisposition, the mother's diet and lifestyle affect.

Ultrasound examination in the second and third trimesters will have an error of up to 2-3 weeks, because the children are different and the weight of newborns can vary from 3 to 5 kilograms.

Inexperienced gynecologists can use the date calculated by the computer as a basis, and after the "estimated 40 weeks", begin to take unnecessary measures in connection with the "delayed" pregnancy.

Finally, almost as accurate as an ultrasound can be considered a gynecological examination on a chair.

An experienced doctor, by the size and shape of the uterus, will be able to determine the gestational age by touch, based on which further calculations will be made, which we determined at the beginning of the article.

It should be borne in mind that you cannot rely one hundred percent on any of the listed methods, they are approximate and give a result that can vary by 2 weeks in one direction or another. It is worth focusing on your feelings and nature, which is never wrong.

Our online pregnancy calculator will help you calculate your pregnancy by week. Pregnancy is an amazing period in the life of any woman, when a new life appears and develops inside. This is happening at a fairly fast pace. In 9 months, the fetus goes through stages of development from a few small cells to an organized organism. With each week of pregnancy, the little one undergoes certain changes, improves existing systems, acquiring new qualities. Therefore, it is very interesting for the expectant mother to find out during the whole interesting situation what is new with the baby, what he is like, what he can do at this stage. Description next.

How to calculate the gestational age by week

For this, an interactive Pregnancy Calculator is intended, which allows you to calculate a woman's pregnancy by weeks, thus finding out the approximate date of birth of the child. The calculation is carried out from the first day of the last menstruation, although it is more correct to consider the term of conception from ovulation. Although the exact time of ovulation is not always known, the pregnancy calculator reflects the timing for the more common cycle of 28 days. With a long or short cycle, amendments are possible, although in practice it is customary to calculate the gestational age of a woman by menstruation. This Pregnancy Calendar is designed to calculate the timing of key moments in fetal development and includes a birth calculator.

What is gestational age and how is it calculated? It is customary to single out obstetric and embryonic terms, and many mothers simply get confused in these terms, and today we will try to figure it out.

The first thing we will start with is the obstetric term, because in fact, our gynecologist will make all calculations based on the obstetric term.

obstetric term
The obstetric period is calculated from the first day of the last menstruation, so when you go to the gynecologist for the first time, clearly know the date of your last menstruation, this will make your life easier, and in the future all of your data will be entered in a special card, everything will be written there.
The obstetric period involves 280 days of pregnancy, well, these are averages, it is clear that each mother is an individual and this period may vary, but it is customary to consider 280 days.
According to the obstetric period, they issue directions for tests, a certificate of maternity leave and all other documents that you will need in the future, the same exchange card, where all the data will be put on the basis of the obstetric period.
And according to the obstetric term, the estimated date of birth is calculated, this is the PDR.

How to calculate the expected due date

The first day of the last menstruation, 3 months ago and 7 days are added, so you can calculate your gestational age and when your baby will be born.

Embryonic term
It is calculated from the moment of conception and is usually shorter by 14-15 days of the obstetric period.
That is, in fact, we all know biology, menstruation has passed and a new cycle of egg formation has begun, and on day 14-15, on average, it matures and is ready for fertilization, this is called the day of ovulation.
In fact, it will be very difficult for us to determine and calculate the exact day of ovulation, of course there are different tests in the pharmacy, you can buy and know exactly when you ovulate,
but in principle it is very difficult to determine or calculate, because fertilization itself occurs on the day of ovulation, plus or minus 3-5 days.