I had not taken my pill form of birth control totally perfect so when my boy friend thought he might have ejaculated a little inside, I took Plan B moments after it happened. This was the day before i was supposed to get my period. Its been 3 days and no period. I know Plan B can delay your period for up to a week, but my next birth control pack starts this Sunday (it is now Thursday). Should i start taking my new pack or wait to see if my period comes? Please help.