Hello dear I understand your concern Do not worry, you are completely safe. Chance of the pregnancy is nil because 1. You did sex in the safe period of the cycle and during that ovulation not occur so no fertilization has been take place. 2. Unwanted 72 is highly effective in preventing the pregnancy around 95%. Bleeding is deu to progesterone withdrawal effect and common side effect. I think delayed period is due to hormonal imbalance that cause delay in the period. (Unwanted 72 contain high progesterone and cause prolongation of second phase of cycle). Wait for the period come, avoid stress, drink plenty of water and do regular exercise. Hope this may help you Contact HCM for further health query Best regards Dr. Sagar