Hello dear I understand your concern Do not worry Chance of the pregnancy is nil because 1. You did sex in the compete safe period of the cycle 2. I pill was taken with in 2 hours, It is highly effective in preventing the pregnancy (just 1-3% failure rate) I pill contain high progesterone that cause prolongation of second phase of the cycle and delay in the period by 1-2 week. So your period can be delayed. Meanwhile 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 So your period can be delayed