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Conception is the moment when the sperm manages to fertilize the egg, starting the gestation process.
Although it is an easy moment to explain, trying to find out on what day the conception took place is quite difficult, as the woman normally does not experience any symptoms and may have had unprotected intercourse on different days close to conception.
Thus, the date of conception is calculated as an interval of 10 days, which represents the period in which the fertilization of the egg should have taken place.
There are three main ways to calculate the conception period:
1. Through the last period
To find out which days you might have been pregnant, enter the date of the first day of your last period:
It is important to note that this calculator is most accurate for women who have a regular 28-day cycle. It is recommended that other methods be used to calculate the conception period if the cycle is shorter, longer or irregular.
Conception usually takes place 11 to 21 days after the first day of the last period. Thus, if the woman knows the first day of her last period, she can estimate a period of 10 days in which conception may have taken place. To do this, just add 11 and 21 days to the first day of the last menstrual period.
For example, if the last period appeared on March 5th, it means that conception must have taken place between March 16th and 26th.
2. Through estimated date of delivery
This technique is similar to calculating the date of the last menstrual period and is used especially by women who do not remember when the first day of their last period was.Thus, through the date estimated by the doctor for delivery, it is possible to find out when the first day of the last menstrual period could have been and, then, calculate the time interval for conception.
Usually, the doctor estimates delivery for 40 weeks after the first day of the last menstrual period, so if you remove those 40 weeks from the likely date of delivery, you're left with the date of the first day of the last menstruation before pregnancy. With this information, it is then possible to calculate the 10-day period to conception, adding 11 to 21 days to that date.
So, in the case of a woman with an expected date of delivery for November 10th, for example, 40 weeks must be taken to find out the possible first day of the last menstruation, which, in this case, will be the day February 3rd. To that day, you must now add the 11 and 21 days to find the 10-day interval for conception, which must have been between the 14th and 24th of February
3. Through gestational age
To know the date of conception from the gestational age, it is necessary to count backwards. That is, if you are 20 weeks pregnant on November 15th, for example, by subtracting 20 weeks, you can verify that the date of your last menstrual period was on June 28th.