"i have taken plan b 3 times so far and has worked every time. first time in july 2012 i had unprotected sex took plan b 4 hours later and got my period with no delay on the exact day i was supposed to get it. the second time in september 2013 i just finished having my period on 8/20 and had protected sex on 9/4, the condom broke so i took plan b 2 hrs later and got my period 2 weeks early on 9/9. the third time i took it was march 2014. had a condom break so i took plan b on 3/21, 4 hrs later. i was suppose to get my period on 4/2/14 but got it yesterday it came 3 days early. never been so happy to see my period. if you are worried that the pill may not work don&#039;t be! it does work when you take it writhing the 72 hour time frame."