Started period on 4/20/08,ended on 4/25 and had unprotected sex on4/26 and 4/28 took plan b on 4/29 and had sex unprotected on 5/2 and on 5/4 i started to bleed again.I know that it is normal after taking plan b but how do i know when i will ovulate and is this bleeding after plan b a period? 8-| ?