How does one know actual day of conception, so as to be able to count how many weeks pregnancy is

Pregnancy

1 person like this

Kattie

U start counting from the first day of ur last menstruation

07-01-1979

D first day of ur last period u count from there

07-01-1979

But why the first day of last menstration, instead of first day of ovulation

07-01-1979

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