Why do we calculate the length of a pregnancy from the first day of a women’s last period?
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There’s some talk of “we don’t know when a woman ovulated” but we do know that for most women who track their periods, their ovulations, and/or are trying to conceive.
Like, my wife knows the exact day she ovulated for the kid we had. But they still go off the last period, and doctors still assume cycles are 28 days or say “it varies” even when you know how long your cycle is.
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