I have irregular periods, they usually come every 3 months even 6 months sometimes, I've been to see the GP on a number of occasions, I've had ultra sound scans, urine sample tests, blood tests yet they don't find anything wrong with me. Anyway I had unprotected sex and within 8 hours I took the morning after pill I'm just wondering because of the irregularity of my period will the pill not be effective? meaning will it work? I'm very worried!