"i had unprotected sex with my boyfriend and of course we weren&#039;t thinking clearly, but anyway i took the pill at exactly 48 hours afterwards and came on my cycle a little past a week.  the new european study that says it doesn&#039;t work for women over 175, it&#039;s not true i&#039;m well over 175 and currently on my cycle... be sure to take it within 72 hours and if you have the funds i&#039;ve also heard of some women taking another pill 12 hours again after the first. hope this helps."