I had my normal period on July 15 - 20. It was the same flow as usual. My periods begin somewhere around the 15th of each month. My boyfriend & I never have actual intercourse; we only engage in anal. We did this on July 25, 26, and 28. I cover up my vaginal opening just so he doesn't accidentally slip in. He never gets off in me because we stop before he gets off. Well, on the night of the 28th, I had some brown discharge, and I had a lot yesterday. I just assumed it was old blood. Well, around 3:00 p.m. today, I felt like I started my period so I ran to the bathroom, and there was a lot of blood - almost like my normal period. I put in a tampon and when I removed it later on, it had some blood on it but it wasn't completely full. I'm still bleeding at the moment but not as much. It is approximately 10 days since my last period ended. Is this my period starting early or possibly implantation bleeding? Do you think I could be pregnant?