Hi. Thanks for asking in Healthcare Magic. i pill contains progesterone which prevents the implantation (attachment) of fertilized ovum in the uterus by making the uterine lining endometrium unsuitable for nidation. It also results in withdrawal bleeding. It should be taken within 72 hours of intercourse. Since i pill contains high dose of progesterone it may interfere with her menstrual cycle and can result in delayed period. So do not panic. You can exclude pregnancy through blood test which is more accurate than urine test and it can detect pregnancy at much earlier stage. Although abortion kits are available over the counter, it is advisable to take them only under your treating Dr s supervision to avoid complications like incomplete abortion and rupture of uterus. Frequent use of i pill will result in side effects and should be avoided. I hope this is useful to you.