i keep posting sorry

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i had sex 4 days before my period was due, it was unprotected but he didn't cum. what are the chances of getting pregnant roughly 4 days before your period, in your non fertile week, by precum? ive had like gassy pains the past 3 days but it might be from stress. idk man just opinions

(i had unprotected sex almost exactly a week ago now, was meant to start my period on saturday)