Birth Calendar: calculate PDR

Children are happiness and the meaning of life. All without exception, mothers remember the day in which they learned about their interesting situation. Excess of feelings, successive experiences and joy overflow the future mother, but at the same time a lot of questions arise. When to go to the doctor, how to lead a new way of life, and, of course, on what date and month does the future birth occur?

As for the doctor, it should be followed immediately forthe precise establishment of pregnancy, the exclusion of any pathology and registration, he will also be able to give many useful recommendations regarding your new condition, determine the approximate date of birth and answer all your questions.

How to determine the duration of pregnancy?

Using the pregnancy calendar, calculate the datechildbirth can and independently. It is necessary to make simple actions: from the first day of the last menstruation take 3 months and add 7 days, and you will get an approximate number.

For example: (date of the first day of the last menstruation) November 7 - 3 months + 7 days = August 14 (estimated date of delivery).

All these calculations are valid if the pregnant woman had a regular 28-day cycle, otherwise the date of birth can only be determined by the doctor, by performing ultrasound and other related methods.

Calculate the date of ovulation

On average, a typical pregnancy lasts 40 weeks,however, childbirth can occur at any time, starting from week 38 and up to the 42nd. In fact, using the calendar, dates of birth can not be calculated exactly to one day, everything is purely individual. Obstetrical gestation period implies the beginning of calculation from the first day of menstruation, and yet slightly different from the real age of the fetus. To calculate the date of ovulation, you need to add 14 days to the number of the first day of the cycle (monthly), and you will understand when the baby was about to be conceived.

Possible difficulties and solutions

Average duration of natural pregnancycan vary, this factor was attempted to relate to the race and the difference in nutrition of pregnant women, but the data obtained did not give any exact results in this regard. In any case, you should conduct your birth calendar, calculate the number of which is quite simple, this will allow you to prepare mentally and financially for the appearance of the baby.

Applying the calendar of births, it is not possible to calculate the exact date for every woman, and there are a number of reasons for this:

• Irregular menstrual cycle.
• Different duration of the menstrual cycle in different women (from 21 to 42 days).
• A woman just can not remember the exact date of the beginning of the last month.

To calculate the length of pregnancy, doctorsuse the term "amenorrhea week", so the report is conducted starting from the first day of the cycle, that is, the last monthly. However, sometimes calculating the date can be difficult. In the case of a non-permanent cycle, ovulation can occur at a very unexpected time, in which case the estimated date of delivery can be determined by echography from 6 to 14 weeks of delay. Determining the age of the fetus is undoubtedly important, as it gives doctors the opportunity to evaluate the development of the baby and the state of his health.

When exactly to wait for childbirth, and whether they always occur on time?

Even if the day of childbirth was determined with the help ofUltrasound, this does not give a full guarantee that the baby will be born on this date. Only a small percentage of calculations are confirmed in practice, in most cases, births occur +/- several days and even weeks around the appointed time. This is explained by the fact that the fruit is considered ripe from the 38th week, and it can appear at any time, up to 42 weeks.

Establishment of an estimated date of delivery with ultrasound

Ultrasound allows the most accurate determination of the age of the fetus and PDR (the estimated date of delivery).

In the first trimester, pregnancy is determinedon the basis of measurements of the diameter of the fetal egg or in determining the fetal heartbeat. The first heartbeat in the baby is observed already at 5-6 weeks of pregnancy.

During the third trimester, the doctor calculates the gestational age, based on the highest value of the head circumference, the width of the fetal head and the length of the femur.

In most cases, it is easiest to usecalendar of conception and childbirth, to calculate the term of which is not difficult, but in 20% of cases the approximate birthday, determined with the help of ultrasound and the calendar, is strikingly different. In the event that the difference in the dates is not more than 10 days, doctors are based on the calculus from the first day of the woman's menstruation. If the difference is more than 10 days, ultrasound results are taken as a basis.

Determination of gestational age for gynecological examination

If the necessary information is difficult to know, applyingthe calendar of pregnancy and childbirth, the doctor can also calculate the term, also by examining the gynecological chair, probing the size of the uterus and abdomen of the pregnant woman. This method is rather inaccurate, because depending on the physiology of a woman it is quite difficult to accurately measure the height of the uterine fundus, therefore this method is rarely used by specialists, and the greatest preference is given to ultrasound.

The period of gestation and fetal movement

Using the birth calendar, calculate the date of birthcan also be based on the first noticed movements of the child. Using these two methods, you can achieve the most accurate calculations. However, it is impossible to focus only on perturbations, since this gives only approximate information on the date of birth. Studies have shown that for the first time pregnant women notice the movements at 19-21 weeks, while mothers with experience feel the movements of the baby 1-2 weeks earlier.

Birth Calendar: Calculate the length of pregnancy from the moment of sexual intercourse

Date of sexual intercourse, after which it is probablethere was conception, it can be used to calculate the duration of pregnancy only if the woman is sure that the conception occurred exactly at this moment and in no other, for example, if she had intimate relations only once in several months. In this case, by the date of the last sex should be added 40 weeks, then you can find out the expected day of the appearance of the unborn child.

Judging by the above methods, the mosta convenient and quick way to find out the period of pregnancy is the calendar of births, calculate by which the date of birth can any woman and, accordingly, prepare for the birth of a long-awaited baby.