My boyfriend came in me and a week later i started bleeding but not a period. ive bleed before when he came in me 10 days later but wasnt pregnant. what does that mean?

You might have ovulation bleeding which has nothing to do with the sexual intercourse. Your can mark your calendar the bleeding day and then the day you have your period and the duration will be around 2 weeks. However, implantation bleeding can't be ruled out although one week is a little early from sex and implantation. Again, if your period is delayed more than 5 days then do pregnancy test.