implantation happens during the first few weeks of pregnancy when the fertilized egg implants into the uterus. this would have happened for you in September :) why are you curious about implantation at 20 weeks? (i'm just wondering)
yes and noTechnically the day you implant is the first day you're REALLY pregnantBut for some crazy reason doctors count from the first day of your last period...I think because most women don't know when they implant
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