The birth of a new life since ancient times was considered a sacrament. Some people now decide that it is not worth interfering in the affairs of God, while others are trying to determine the day of conception, since there may be different reasons for this.
How to determine the date of fertilization?
The simplest and oldest method of determining the day of conception of a child is the calendar method. For this it is sufficient to know the exact number of days in the menstrual cycle and from this figure to subtract the duration of the luteal phase. This is the period when ovulation occurs, a meeting of the spermatozoon with the ovum, its implantation into the walls of the uterus and further development. In 90% of cases it lasts 14 days.
For example, consider a cycle that consists of 29 days: 29 - 14 = 15. So, ovulation occurred on the 15th day of the menstrual cycle. And this means that fertilization occurred on this day or the next, because the female ovum lives no more than 48 hours. On the question whether it is possible to determine the day of conception by this method, for girls whose menstruation is irregular, the answer will be negative, since it is not possible to know the exact number of days in the cycle when conception occurred.
Is it possible to determine the day of conception by ultrasound - one of the difficult questions. Ultrasound is more aimed at studying the development of the fetus in a timely manner. The doctor examines the crumbs and on the basis of the information received and the date of the last menstruation will put obstetric pregnancy. In order to calculate the date of expected ovulation on the basis of these data and, consequently, of conception, it is enough to take two weeks from it.
So, it is possible to determine the exact date of conception, but it should be remembered that almost always there is an error and, as a rule, it is from 2-3 days to a week. The ultrasound method is also not 100% reliable, although the opinion of a specialist in this field may play a role in confirming the date calculated by the calendar method.