I ended my period on a Thursday, and had unprotected sex the following Monday. I did start a new pack of my birth control but not until Sunday...and I actually haven't taken it all week, in case I am pregnant. My boyfriend did ejaculate inside of me. Well, we had sex everyday that week. But he didn't ejaculate every time. Starting this Monday, so a week later, I started bleeding. It is a light redish brown color, but enough to to where I had to wear a pad. Could I be pregnant?