I had unprotected sex last saturday and my period started about a day and a half later. It was two weeks earlier than usual so being concerned, I googled it and found that usually that was a sign of pregnancy. That day (still being within three days of the unprotected sex) I took Plan B. My period is still going and it's been about 5 days and it is fairly heavy. Will this go away soon? And has anybody else had a similar situation to this?