WHAT HAPPENS IN THE FIRST 3 WEEKS OF GESTATION - PREGNANCY
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Baby development - 1 to 3 weeks of gestation



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The first day of pregnancy is considered to be the first day of the last menstrual cycle because most women can not know for sure when it was their most fertile day, and it is also not possible to know on what exact day fertilization occurred since the spermatozoon can survive up to 7 days inside the woman's body