Estimates only - not medical advice.
Pregnancy is dated from the first day of your last period. We count the weeks and days since then, identify your trimester, and estimate your due date at 40 weeks.
Find more pregnancy and fertility calculators on the home page.
Counted from the first day of your last period - this tool does it for you.
First: weeks 1-12. Second: 13-26. Third: 27 onward.
About 40 weeks from your last period, with full term considered 37-42 weeks.
It’s the standard clinical method since conception timing is rarely known exactly.
No - see your doctor or midwife for prenatal care.