Count pregnancy time in weeks and days - Childbirth | Zoonk

Count pregnancy time in weeks and days - Childbirth | Zoonk

Count pregnancy time in weeks and days

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A close-up of a simple monthly calendar with the first day of the last menstrual period circled in red and labeled “LMP = day 0,” with a counting arrow starting from that date; leave conception unmarked except for a small gray “unknown” question mark later on the calendar.

Start the clock at LMP

Pregnancy time usually starts on the first day of the last menstrual period, called LMP. That feels odd, but it gives everyone one date to count from when the exact conception day is unknown.