Due date based on of intercourse?

Calculating your due date based solely on your estimated date of conception (EDC) or the date of intercourse can be less accurate compared to using the date of your last menstrual period (LMP). However, if you know the approximate date of intercourse and have regular menstrual cycles, here's a general guideline to estimate your due date:

1. Add 40 weeks (280 days) to the first day of your last menstrual period (LMP). This method assumes a 28-day menstrual cycle.

2. Alternatively, count back 3 months from the first day of your last menstrual period and add 7 days. For example, if your LMP was January 1st, count back 3 months to arrive at October 1st and then add 7 days, leading to an estimated due date of October 8th.

Please note that these estimation methods can have a margin of error of up to 5-10 days, as conception may not occur exactly on the day of intercourse, and variations in menstrual cycles can affect the accuracy of calculations. To obtain a more precise due date, it's recommended to consult with a healthcare provider who can consider various factors and perform an ultrasound examination to confirm the gestational age of the pregnancy.