<s>[INST] hi doctor Last month i got periods on 18 th of july and me and my husband had sex on aug 15 and 16 and i took postpone 72 on aug 17. Today is aug 20 still i didnt get periods we dont need a baby now. My periods is more or less regular is there a chance to get pregnant ?? Thanks nd regrds Xxx [/INST] Hello dairy understand your concerned not worry. Pregnancy chance is nil because1. You have done sex in the safe period of the cycle and no ovum is released during this time, so no fertilization take place.2. Posting 2 is 95% effective in preventing pregnancy. Your period is delayed is just due to hormonal imbalance caused by the Posting 2. It contains high progesterone and cause prolongation of second phase of the cycle and delay period. Avoid stress, take healthy diet and do regular exercise. Hope this may help noncontact Chat Doctor for further health query Best regards </s>