"so me and my boyfriend had unprotected sex. my period ended december 27th and we had unprotected sex on january 1st. he didn&#039;t know if he cummed or not so to be safe i took a plan b pill about 3 hours after. it caused my period to be 3 weeks late, but today february 8th my period started. i was constantly on here reading reviews and stressing myself out. so if you are stop it!! it works!! just give it time"