So I got my period August 14, it ended August 18. Me and my fiancée had slip that happen august 21 and I took plan b the next day and got my period again august 28 and it ended sept 1. Then we went on vacation from sept 12 - 15 and used condoms but still i havent got my period and I took a home pregnancy oct 1 and it was negative .. what do you think of this ? and has this happen to any one ?