For example, on the ultrasound, 12 weeks of pregnancy had a woman on February 15. We consider up to the fortieth week, we know the DA - August 30. And, even retringing two weeks ago, as in 38 weeks there is already a pregnancy of donoshen, we understand that childbirth will be in about the second half of August: from 16 to 30.
Suppose the last time the monthly began on May 1. Send 3 months ago - this is February 1, and add a week. Thus, it can be assumed that 40 weeks will be February 7, but, given that at 38 weeks, the pregnancy is already dead, one can expect that the baby will be born from January 25 to February 7.
Not the first thought that visits a woman as soon as she sees the cherished two stripes on the test to determine pregnancy, after, of course, the sacramental phrase "How to tell dad?" - This is "And when, actually, the baby will appear on the light?" We'll see now. Prepare a sheet of paper, pen and calendar.
The first thing to remember: any PDR (the estimated date of birth) is the relative value. And give birth to day a day, as the calendar promised, you can only if you have a planned caesarean, but we hope that this is not. In all other cases, deviation is allowed for 1-2 weeks in one direction or another.
In the older times, when neither an ultrasound, nor blood tests at HCG did not exist, the estimated date of delivery was determined by the first chapels of the baby. It is believed that the primordines are experiencing them on the 22-24th week of pregnancy, but repeatedly - on the 20th. So, it remains only to add to the date of the first movement or 22-24, or 20 weeks.
There are several different ways, methods, techniques, how to find out the date of delivery. They are based on the well-known physiological features of pregnancy. It is known, in particular, that on average, normal pregnancy lasts about 40 weeks, if you count from the beginning of the last menstruation. Absolutely accurately calculate the date of birth, of course, it is impossible. Dates of pregnancy all women are different. But all pregnant women know how to correctly calculate the estimated date of birth. The error is most often for several days.
How to calculate the date of birth? You can, for example, to determine the date of delivery by the date of conception, if there is a basis more or less accurately assume what day it happened. From the date of conception, respectively, just count the time of pregnancy.
DRD - the estimated date of delivery. In order to determine it, you can, including, use the so-called "calculators" that are available today and online. On each such service on the Internet there are instructions, how to determine the term of pregnancy, how to calculate the date of birth (DA) on the last month. This can be done literally in a few seconds.
Calculate the estimated date of birth, it is possible not only with the help of a calculator on the Internet, but also independently. There are several ways. All of them have an error, but with a competent count, it is possible to calculate the estimated date of delivery at an accuracy of the week.
Let's start with the fact that the conception is the process of merging the female and male sex cells, or the fertilization of the egg spermatozooid. Surely you already know that such an event happens as a result of an unprotected sexual intercourse, when male sperm penetrates freely into the vagina.
From the vagina, the spermatozoa is moving along the cervix and fall into the uterus. And already from there, "against the current", in the uterine (phallopy) pipes strive towards the ovary. Most often, the fateful meeting of the spermatozoa and ready for fertilization of the egg seizites in one of the Falopian pipes, on the segment of the path that is closer to the ovary.
In order for conception to have happened successfully, about 10 million spermatozoa needs. All this "friendly company" is needed in order to help a single spermatozoa pass through all the obstacles and penetrate the egg.
It is worth noting that you get to the cherished goal, spermatozoa is quite difficult. Their movement prevents the cervical mucus, which protects the uterus from harmful microorganisms. Also, male sex cells need to be very trying to ensure that joint, multi-million efforts to destroy the egg shell - a radiant crown.
spermatozoa "work together", and only one of them reaches the so-called "shiny shell" of the egg and penetrates it. Next occurs an exciting moment, which experts call "Polyspermia". If you lower medical details, it turns out that the dominant sperm changes the structure of a shiny egg shell, and that becomes inaccessible to penetrate the remaining spermatozoa. Through time, "less talented" men's genital cells die, and a new life is born inside the egg inside.
Extremely rarely, two spermatozoa fall into the egg cell, but such fertilization generates a non-visual embryo with chromosomal disorders, which dies within a few days. If the development of pregnancy is still happening, it is most often doomed to interrupt. Thus, nature produces natural selection. In Europe, experts deliberately do not preserve a problem pregnancy to the period of 8-9, sometimes 12 weeks to not give life to a weak fetus with genetic disorders.
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