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'exactly' when does 1st trimester end - 12weeks 0days or 12weeks 6days ? (more)

From: ambika (anonymous@obgyn.net)
Tue, 12 Nov 2002 09:44:50 -0600 (CST)


i read on the net that each trimester is 13 weeks and 2 days to be very precise, then why do we say that the first trimester lasts 12 or 12+ weeks? many thanks!



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