"this works ! so let me just tell you my story. me and my boyfriend had sex october 9 which was the day after my ovulation i took the pill 8 hours later october 10. then when i was taking the pill it fall in the water bottle so i had to drink the whole water bottle.  for the whole october i didn&#039;t have a period. it was so stressful but i didn&#039;t want take a pregnancy test. and bam today my period comes on. so don&#039;t worry it took almost a whole month for my period to come and don&#039;t listen to people who say if you are ovulating it does not work because it does."