Estimates only - not medical advice.
Conception usually occurs about 266 days before the due date (or ~14 days after the last period started). We give a best estimate plus a ±3-day window.
Find more pregnancy and fertility calculators on the home page.
It's an estimate; ovulation timing varies by cycle.
Either works - a dated ultrasound is most precise.
Sperm can fertilize for several days, so conception falls in a range.
No - confirm with your provider.