Ok, my girlfriend has been on birth control since January 2009 and on a Friday September 24, 2010 she forgot to take her pill but took one on Saturday, two on Sunday and has been taking it daily ever since. Then on Tuesday September 28, 2010 her period was over the day before, and on that Tuesday we had sex on that afternoon, but on that same night she started bleeding. She thinks it's her period again for some reason, but I'm not sure. She's still bleeding but not as heavy as when she started on Tuesday night. I'm not sure if she's pregnant or what's going on. Can anyone help me know what's going on?