Medical Q&As

Morning after pill - didn't work?

Please can you tell me why the morning after pill may not work, even though it was taken within the 72 hours and taken properly? My periods are now over due by a few days.

Your period is only a few days overdue therefore it is possible that it is simply late. However, the morning after pill does have a failure rate and is not 100% guaranteed to prevent pregnancy. If unprotected intercourse took place around the time of ovulation and the pills were taken near the end of the 72-hour period then the risk of failure increases. However, this increased risk of failure is very marginal. Wait a few days more and in all probability your period will come.