Your due date if you conceive today
A pregnancy lasts about 38 weeks (266 days) from conception, or 40 weeks from the first day of the last period. So if conception happens today, your estimated due date is 266 days from now — shown at the top of this page and recalculated every day using your device’s date.
Conceiving in the next few weeks
| If you conceive… | Estimated due date |
|---|---|
| today | |
| in 1 week | |
| in 2 weeks | |
| in 1 month (30 days) |
Sex today vs conception today
If you are asking because you had sex today, remember that conception may not happen today. Sperm can survive for up to about five days, so conception can take place any time until a few days after ovulation. That makes your possible due date a range of about a week — the Pregnancy Due Date Predictor calculates it from your intercourse dates.
What happens next
- Implantation usually happens 6–12 days after conception.
- A home pregnancy test is usually reliable around the day your period is due — about two weeks after conception. See the Pregnancy Test Calculator.
- If you are trying to conceive, the Ovulation Calculator shows your most fertile days.
Planning for a particular birth month? The month-by-month pages, such as If I Get Pregnant in January, show the due dates for every day of a month.