"we had a comdom mishap on september 27, and i took the pill 12 hours later. i didn&#039;t have any side effects, and i got my period, right on time, october 2nd. maybe it was just not a fertile time for me, i&#039;m not sure. i know i was done ovulating so i probably wasn&#039;t even fertile anyways, but needless to say, i went and got birth control and i&#039;m taking it after my period is over."