My boyfriend and I had sex on Sunday, we used condoms and I'm on birth control that I take as perfect as you can (always in between 9 and 8 everyday) I've been on birth control for over a year. The condom irritated me and I felt sore and had some bleeding after sex. It stopped for a day and on Tuesday I started to bleed brown and red blood, it stopped this morning. It was a little more than spotting so I thought it was my period starting but then it stopped. My period isn't due for a week. My boyfriend and I have had sex more than once this month but we've always used condoms and birth control. I'm worried this could be implantation bleeding. Is it? Should I be worried? Or is it just bleeding from the sex?