Hi Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern... Delay in periods is a common problem after intake of postinor 2. The delayed periods are due to effect of high dose of levnorgestrel in postinor 2 which disrupts your normal menstruation & causes delayed periods. your periods may be delayed for 1-2 cycles. The chances of pregnancy are less post intake of postinor 2. An emergency contraceptive pill like postinor prevents pregnancy by inhibiting implantation of fertilized egg on to uterus. It is 95% succesful if taken within 24 hours of having sex. As you had taken all two tablets of postinor 2 at a time within 24 hours, pregnancy possibility should be very less. Postinor 2 is an emergency contraceptive & should not be used as regular method of contraception. Emergency contraceptive pills have higher side effects than other regular methods of contraception such as regular birth control pill, condom etc. If your next period is delayed by more than 2 weeks you should undergo a pregnancy test to rule-out pregnancy possibility Refer to a gynaecologist for more queries Don t worry you would be fine Hope this information helps