Hello dear I understand your concern I pill is very effective in preventing pregnancy as you took with in 24 hours of sex. It has around 95% effective in preventing pregnancy. But I pill can cause high chance of hormonal imbalance as you took I pill frequently in short period time. It may cause earlier period, delay in period by 1-2 weeks, excessive bleeding can occur. If your period will delay by more than 2 weeks then consult gynecologist and undergo urine pregnancy test and or blood HCG test to confirm pregnancy. Do not use I pill as regular contraception. Use condom to prevent unwanted pregnancy. Avoid stress, take healthy diet, drink plenty of water, do regular exercise Hope this may help you Best regards Dr. Sagar