How to calculate pregnancy that's right: manual

As soon As the woman learns of the pregnancy, one of the main issues and relatives, addressed to her, becomes: “When is it due?”. Of course, to determine the date of childbirth, it is important to understand at what period of pregnancy is the expectant mother at the moment. How to calculate pregnancy due date?

Special period

Everyone knows that pregnancy lasts 9 months, but this figure is approximate. Accurately determine the date of childbirth to the week will fail though, because a living organism – is not a mechanism, but something more complex and individual. Pregnancy – an amazing time from the moment of conception in the mother's body develops a separate person with its own DNA and blood type, which may differ from the parent. In the placenta, which is the barrier between mother and fetus, there are two layers – maternal and fetal. The mother's blood and fetal blood do not mix, but exchange substances – from the mother the baby receives nutrients and from the fetus excreted waste products. One can only imagine how complex the process of development from a single fertilized cell and the whole human organism with all systems of organs and tissues, complex brain! Of course, the timing of this development can fluctuate and do not necessarily fit into the expected figure. Much better is the maturity of the child's body and processes in the mother's body, showing the readiness for the birth.

Many children are born 1-2 weeks earlier than expected. This is normal and does not affect their health – by this time they are already considered full-term and typically have a height and weight within normal limits.

An Obstetric and pregnancy

The pregnancy is determined in two ways. As you know, pregnancy begins at conception, i.e. fertilization of the egg. 80% of the time from that moment until birth is 266 days, or 38 weeks. It – the true duration of pregnancy. However, not all women know the date of conception. Especially if the sex life is regular, but the menses-not very, so to say exactly in which period occurred ovulation, difficult.

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Comes To the rescue another way to determine gestational age – obstetric. It allows you to calculate the pregnancy for the last month. It is noticed that since the beginning of the last menstruation prior to delivery usually takes 280 days, in other words, 40 weeks. Therefore, the date of the onset of menstruation is considered to be the date of the beginning of pregnancy, although the objective conception happens about 2 weeks from that day.

How to determine your due date?

As has been said, can add to the start date of your last period 40 weeks. To calculate the duration of pregnancy in weeks convenient on the calendar. There is a method of Negele. It proposes to move the calendar backwards rather than forwards because the years are cyclical. It is sufficient to subtract from the date monthly for 3 months and add a week. It's all known methods, how to calculate pregnancy month.

Ultrasound

If your periods are irregular and you're not sure what exactly remember the date of the last menstrual period, specify the period will help ultrasound. However, this method is more accurate in the early period of pregnancy until about 7 weeks. At this time, all embryos are alike. Later, the development of each little body goes at its own pace, so the definition of the term can only be approximate. The longer the pregnancy, the harder it is to determine the date of conception.

The size of the uterus

A Gynecologist can determine the date of conception only in the beginning of pregnancy. But starting from the 2nd trimester, the physician can palpate the uterus and determine its length. Every week it increases by 1 cm, and tell the doctor how to count the duration of pregnancy. But these calculations also are not guaranteed to be accurate.

The location of the uterus relative to the pubic bone and navel, too, is changing with increasing duration. At 12 weeks the uterus is located in the upper part of the womb. At 16 weeks, her bottom is between the navel and the bosom. 20 week on all approaches to your position to the navel, but not reaching it. And at 24 weeks the uterus reaches the navel. At 28 weeks the fundus is at 2 fingers above the navel. In the 32nd week it is located between the xiphoid process of the sternum and the navel. At week 36 the uterus rests on the bottom edge. The navel is smoothed. In this position, the body may compress the lungs and abdominal organs, in this period a woman experiences the maximum discomfort. Abdominal circumference usually reaches 90 cm

40 week belly fall down a bit. Baby ready to be born, and the uterus is also preparing for this event. Therefore, the bottom of the uterus, again, is between the xiphoid process and the umbilicus. The navel bulges, and the circumference of the stomach becomes even more. The average – 95-98.

Calendar method

This method is a daily measurement of basal body temperature. It is measured in the morning in the rectum at the same time. Data is written in the formgraphics. The lowest drop in temperature will be talking about ovulation, followed by sharp rise. This method is used when protection. However, if the goal is to get pregnant, a woman watches the ovulation date with an entirely different purpose. Date of conception will tell you how to calculate the duration of pregnancy. Could be related to the calendar method a situation when the sexual life is irregular, so you can tell exactly the date of possible conception.

Test HCG

Use this analysis to determine the presence of pregnancy and detect abnormalities in the embryo. Approximately at the level of this hormone in early pregnancy is possible to determine the time. The accuracy of this method is no different.

First movement

Another very rough guideline to determine the period is the fetal movement. Women pregnant for the first time usually feel him at 20 weeks. The second and third pregnancies you can feel it earlier. Usually 18 weeks. These movements of the child are very weak, someone they resemble the gurgling of someone stroking or tickling. Sometimes women can confuse them peristalsis, because pregnancy is changing his job and increased flatulence. Here are about 24 weeks, these movements are more distinct and resemble tremors. Moreover, other people, prikladyvaya hand to her stomach, unable to feel through the abdominal wall. You can try to count the period of pregnancy as the movements of the fetus, and other characteristics, but rely on the accuracy of these results is not necessary. Although in the past, when medicine did not know many of the methods of diagnosis, and usually a defined period for the movement of the fetus.

Belly Size

An Obstetrician-gynecologist not just at each visit, measures the stomach of the patient. For increasing it is possible to judge about the time of future delivery. However, it is important to take into account the size and weight of the women.

What to trust?

How to calculate the exact duration of pregnancy? The most accurate your calculation will be the case if you know the date of conception. Then you will be able to accurately determine the duration of pregnancy in weeks. But the date of birth you can only be determined approximately. During pregnancy with your doctor this estimated date will be adjusted. Closer to the event processes in your body will signal readiness for birth.

The Most accurate method to calculate the duration of pregnancy in weeks, as you know, allows still doctor's consultation, which will be considered and the date of your last period or the exact date of conception, and the ultrasound, and the size of the stomach, and the height of standing uterus. All factors can give a reliable result. But count on the fact that you accurately predict your due date until the day, not worth it. The element of uncertainty always remains, and get ready for a baby 1-2 weeks early or late.

How to calculate pregnancy by yourself? Not to stray from the account, there are calculators of pregnancy, which date the onset of menstruation enable to compute the term at the moment, and date of birth. And yet, all pregnant women attend antenatal clinic, therefore, to clarify this matter with the obstetrician-gynecologist.