My last normal period started around 2/12/07. About two weeks later I had sex with my boyfriend and had an intense orgasm. The next day (2/26) I started bleeding again. There have been a couple of semi-heavy days, but mostly it has been light bleeding and has not stopped. I'm 25 and in good health, not on any sort of medications or bc. Any thoughts on why this would be happening? I'm getting concerned because this usually doesn't happen.