Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP).

Is pregnancy calculated from date of conception?

The development of pregnancy is counted from the first day of the womans last normal menstrual period (LMP), even though the development of the fetus does not begin until conception, which is about two weeks later.

What is considered date of conception?

The conception date refers to when a baby was conceived. Since sperm can live inside the vaginal canal for three to five days, conception can take place up to five days after sexual intercourse. Fertilization depends on ovulation and can occur within 12-24 hours from the release of the egg (ovulation).

Are you actually pregnant at 2 weeks?

Your weeks of pregnancy are dated from the first day of your last period. This means that in the first 2 weeks or so, you arent actually pregnant – your body is preparing for ovulation (releasing an egg from one of your ovaries) as usual.