"my husband had just got a vasectomy, but there is a period of time where men are still fertile and we hadn&#039;t been cleared yet for zero sperm count. we had a few drinks and forgot to use protection. we knew i had either already ovulated or was about to ovulate at the time of our oops. the next day i took the pill and within a few hours i could tell it was taking effect. i got a lot of cramps on one side which kept occurring periodically for the two weeks after. i had some dizziness and extreme fatigue for a few days. the side effects were all listed on the package though. i think since i took the pill right around my fertile time it didn&#039;t mess up my cycle much. i started right on the day i was supposed to exactly two weeks after our oops."