

By adding 11 to 21 days, you can calculate that the conception date would have been between the 14th and 24th of February. This means her last period started on February 3. Once you know the first day of your last period, you can add 11 to 21 days to figure out your conception date.įor example, a woman who is due on November 10 can calculate the first day of her last period by subtracting 40 weeks. Therefore, if you have your due date, you can subtract 40 weeks from this date to determine your last menstrual period. Generally, the due date is calculated 40 weeks after your last period. By knowing your estimated due date, you can calculate when your last period started, and from there, you can calculate your conception date. It is especially used by women who do not remember when their last period was, and for women who have irregular periods. This method is similar to calculating your conception date using your last period. The due date is 40 weeks from the first day of your last menstrual period (LMP).

Charlsie Celestine, Flo board member, obstetrician, and gynecologist (OB-GYN), explains. The 9 months of a pregnancy are actually 40 weeks, Dr. Therefore, if you know the first day of period, you can add 11 to 21 days to this day to have an idea of when conception occurred.įor example, if you are pregnant and your last period started on March 5, that means you likely conceived between March 16 and 26. How is due date calculated Lots of us assume that a pregnancy is exactly 9 months long, but that’s not the case. Information and education will help you make your best decision.For women with a 28-day cycle, conception generally occurs between 11 and 21 days after the first day of your last period.
CONCEPTION TO DUE DATE MONTH FREE
This can be anywhere from 11-21 days after the first day of your last period, and you know the exact day that encounter took place.Ĭall Clearway Clinic at 50 and we can provide you with more information with a free ultrasound.

