I have had the same boyfriend for 2yrs we have always had unprotected sex I have regular periods and the last 2 times we have had sex I have begun to bleed ? I'm not due for a period till10/9/09

I had the same problem years ago. I was diagnosed with fibroid tumors and ovarian cysts. This could be causing the problem... or it could be something else. Only a doctor can give you a proper diagnosis, but I would definitely go see one soon if I were you.