Hello dear I understand your concern Your period is delayed due to emergency contraceptive pill. Pill contain high progesterone and cause prolongation of second phase of the cycle. So it may cause delayed in period by 1 to 2 week. There is very less chance of the pregnancy as you took pill with in one hour of sex. It is highly effective in preventing the pregnancy. It has just 0-4% failure rate. So wait for the period to come. If period will delay by more than 2 weeks then go for urine pregnancy test and or blood HCG test to confirm the pregnancy by consulting the gynecologist. Meanwhile avoid stress, take healthy diet, drink plenty of water and do regular exercise. Hope this may help you Contact further if follow up needed. Best regards Dr. Sagar