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about 3 weeks after having sex with my bf, (we did not use a condom, but he did not ejaculate inside of me) i was experiencing pains low, maybe my uterus. for like a week and a half. in my 6 years of being on my cycle i have never had cramps. i was on my period during the intercourse. and then i had some really realy lite bleeding at the begiining of the month, which is abnormal because my period has always been at the end of the month. then about a week after the spot bleeding, i still had pains at this point, then i wake up in the middle of the night, and there is blood running down from my leg, there was so much blood. the pains stopped that day, did i have a misscarriage?