So i'm 16 and i've been on tri sprintec for 2 years now. I just became sexually active 5 months ago with the same person, we're both clear of STD's. 6 days ago on saturday, we had sex in the shower and it kind of hurt because there was no lubrication. No bleeding that day and then on sunday he fingered me and it kind of hurt. On sunday night i wiped and there was bright red blood and then it's been dark brown/dark red blood since then. It's been about 6 days now. I'm having not too bad cramping and the flow can fill maybe 2 pantyliners a day. Is this breakthrough bleeding? I started bleeding exactly 2 weeks before my period. Or is something ruptured from poor lubrication? Or maybe a bacterial infection from soap or something? I don't know if this is important but i also went to the beach on saturday so maybe something like sand or dirty water got in there. Is my birth control wearing off because i feel like i've been ovulating and now i'm spotting.