To find out exactly when you got pregnant, you can estimate your conception date based on different methods:
- Using the first day of your last menstrual period (LMP): Conception usually happens between 11 and 21 days after the first day of your last period if you have a regular 28-day cycle. You can add 11 to 21 days to your LMP to estimate your conception window.
- Using your estimated due date: Pregnancy typically lasts around 40 weeks (280 days) from the first day of your last period. By subtracting 40 weeks from your due date, you can find the approximate start of your last period, and adding 11 to 21 days to that date estimates your conception date.
- Using your gestational age: If you know how many weeks pregnant you are, subtract that number of weeks from the current date to estimate your LMP, then add 11 to 21 days for the conception window.
Conception is closely tied to ovulation, which usually occurs about 14 days before your next period in a typical 28-day cycle. The fertile window is around 3-5 days before ovulation and one day after. Conception most likely happens on the ovulation day or shortly after. There are many online conception date calculators where you can input your LMP, due date, or gestational age to find your estimated conception date range. If you provide your last menstrual period date, due date, or gestational age, I can help calculate your estimated conception date. Otherwise, you can use online conception calculators to get an accurate estimate by following these methods.
