I think sperm lasts for 3-5 days inside of you. But it is possible for the techs to be off a couple days. I'm not sure when I concieved, me and my man have a super healthy sex life, but I know when my last period was...I'm 19 weeks and some odd days and my doctor still to this day tells me that I had my period in August but I didn't, lol. Babe measures small because I have high blood pressure and my doc is crazy but sometimes that happens lol. Don't worry too much about it :)
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