Hello dear I understand your concern You took the unwanted 722 pill with in 24 hour of sex. It is highly effective in preventing in the pregnancy (95-98% success). So it has 0-5% failure rate in your case. After taking pill, you have to wait for the next period. If next period will delay by more than 14 days then go for urine pregnancy test to confirm the pregnancy. Pill also cause earlier period and excessive bleeding can occur. You an also go for blood HCG test 10-12 days after sex as it more accurate and give positive result earlier then urine pregnancy test. One time use of unwanted 72 pill dose not cause problem in future pregnancy. But avoid repeated use as it cause menstrual irregularity, ovarian dysfunction and fertility issue. Meanwhile avoid stress, take healthy diet, drink plenty of water, do regular exercise. Hope this may help you Contact further if follow up needed Best regards Dr. Saga