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.

Does weeks pregnant start from 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.