18, 5 3 116 lbs. ; not on birth control but used condom. I had intercourse a week ago and yesterday, though yesterday after we had finished and then i looked at my underwear and there was fresh blood on them, but it stopped. what does it mean? could I be pregnant? My last period was at the end of june, and the last time i had sex before a week ago was in april. This morning when I went to the restroom, there was a little bit of blood on the toilet paper, and each time i go it s pretty much the same just a little barely noticeable. what could it be?