Hello dear I understand your concern You have did sex 4 days before the expected date of period. It is safe period of the cycle and pregnancy will not occur during this days as ovulation is not occur and so no fertilization. You already used one I pill Better to avoid another pill as it cause more chance of hormonal imbalance. No need to take the I pill second time as you did sex in the safe period of the cycle. Do not worry if your period will delay by the 1-2 week as it will cause by the I pill only. Avoid stress, take healthy diet, drink plenty of water and do regualr exercise Hope this may help you Contact HCM for further health query Best regards Dr. Sagar