Why do we calculate the length of a pregnancy from the first day of a women’s last period?
In: 3216
Because you could have gotten pregnant at any time after that period ended. You’re technically more likely to get pregnant during ovulation but there have been cases of getting pregnant when the last time she had sex was in the middle of her period because the Soren survived long enough.
TLDR the last day of your last period is the last day you can *guarantee* that you weren’t pregnant.
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