According to dating calendars, pregnancy officially lasts 40 weeks, beginning with the first day of the last menstrual period. We know that most women ovulate around day 14 of her menstrual cycle, which means the baby wasn't really conceived until at least week 2.
Thus, if the doctor says you're 25 weeks pregnant, the baby was probably conceived about 23 weeks ago.
There's sort of a disconnect between medical dating (40 weeks) and layman's dating (9 months). If you're 25 weeks pregnant, though, you have 15 weeks left to go, which puts you about 5 1/2 months pregnant.
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