i missed one day (1 pill) of birth control during the 2nd week and i made it up in the middle of the day. i had unprotected sex 5 to 6 hours later. then took the next pill that night. he didnt "bust a load" inside me but there was a little bit of jizz seen after he pulled out. ever since then, i took my pills every day like i should have, but now, since its the 4th week and i should be on my period, why dont i have it? what are the chances (a %) of me being pregnant?