Hi, Thanks for posting in HCM. I understand your concern. Unwanted 72 is an emergency contraceptive pill. It needs to be taken within 72 hours after an unprotected intercourse. Earlier it is taken, protection seems to be better. It prevents pregnancy from happening by causing breakthrough bleeding within 3 weeks from the day of its intake. In the meantime, some of the symptoms like vaginal dischrge and intermittent spotting could be considered as normal. In case bleeding in the form of periods does not happen by 3 weeks, she needs to take urine pregnancy test and seek medical attention immediately. The failure rate with use of such pills is 10 to 15%. Hope the information provided would be helpful. All the best.