![]() ![]() To calculate your pregnancy week, you must count the weeks that have elapsed since the supposed day of fertilization. If you have very regular 28-day cycles, your ovulation usually occurs on the 14th day after your period begins. Your fertility period then extends between the 10th and 15th day of the cycle (four days before ovulation and one day after). You can refine the result depending on the date of your intercourse, but in practice, determining the exact date of fertilization is impossible for most women as they don't know the day of their ovulation. That's why doctors usually prefer to calculate weeks of amenorrhea: just count the weeks since the first day of your last period. ![]() This date is much easier to know than your ovulation! How to calculate the expected due date? The majority of doctors and midwives used the Naegele rule to calculate the expected date of delivery. Basically, this rule consisted of adding 7 days to the first day of the last menstrual period, then to 9 months. However, this situation was problematic, as not all months had the same number of days, which theoretically varied according to the length of the pregnancy. For example, for a woman whose last period occurred in May, the pregnancy lasted 283 days, while it lasted only 280 days for a woman whose last period began in June. ![]() Now, professionals will say instead that the expected date of delivery will be 40 weeks after the first day of the last menstrual period. The doctor or midwife calculates the first 2 weeks after the last menstrual period in the number of weeks of pregnancy, even if the mother was not yet pregnant. Thus, when we talk about "20 weeks of pregnancy", we refer to the 20 complete weeks that have elapsed since the first day of the last menstrual period. Is ultrasound more accurate for calculating the date of delivery?Īn ultrasound done in early pregnancy would be more accurate than the first day of the last menstrual period to determine the due date. This is especially true if the ultrasound is performed between 8 and 16 weeks of pregnancy. ![]()
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