Hello dear I understand your concern If I pill was taken with in 24 hours of sex then it is highly effective in preventing the pregnancy. It has 0-5 % failure rate. But you have develop hormonal imbalance because of I pill that cause menstrual irregularity. Bleeding after pill could be due to withdrawal effect of progesterone or implantation bleeding Period can be delayed by 1-2 week from the normal expected period date. If your period will delay by more than 2 weeks then again go for urine pregnancy test and or blood HCG to confirm the pregnancy by consulting the gynecologist. If you wil be pregnant then still you can termiante the pregnancy by the abortion pill under the advise of the gynecologist Avoid stress, take healthy diet, drink plenty of water and do regular exercise. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar Avoid stress, take healthy diet, drink plenty of water, do regular exercise