Hello dear I understand your concern Unwanted 72 was taken with in 10 minutes of sex. It is highly effective in preventing the pregnancy(95-98% success rate). So it has just 0-5% failure rate in your case. So do not worry. Unwanted 72 contain high progesterone and cause hormonal imbalance. It cause early period, delay in period by 1-2 week and excessive bleeding can occur. You can go for blood HCG test. It will give positive result 10-12 days after the sex. You can also wait for the period. If period will delay by more than 2 weeks then go for urine pregnancy test to confirm the pregnancy. If you will be pregnant then you can still terminate the pregnancy by abortion pill under the supervision of the gynecologist. Meanwhile avoid stress, take healthy diet, drink plenty of water, do regular exercise, maintain proper pelvic hygiene. Use condom in future to prevent unwanted pregnancy. Hope this may help you Contact further if follow up required Best regards Dr. Sagar