So I had unprotected sex (never happening again and I regret it) and I am not on birth control but he did withdrawal before cumming. According to this app and another I was not on any fertile days (but it could be off?) and then I got my period a few days later, and then I took Plan B during my period just to be sure, ALTHOUGH I took it past the suggested 72 hours, now after taking plan B my period is lasting a couple days longer than it normally does, is this normal? Google says so many different things and is freaking me out.