"1st experience: on september 2, 2014 got my period and it ended on the 5th, had intercourse on the 12th ( the condom slipped off) went to get plan b at target about 2 hours later. i started spotting the very next day [13th] , however, i only spotted on the 13th and didn&#039;t get my period until the 12th of october. plan b tends to mess with your cycle so i didn&#039;t get my period again until the 8th of december. 2nd experience: got my period on april 17, 2015, had intercourse the 12th of may (condom broke ) i got plan b about 30 minutes later, however, i didn&#039;t spot the next day like i did the first time when i took plan b on september 2014. i was supposed to get my period may 15 th, but i finally got it today [may 20th]. don&#039;t worry it works!"