Dear Dozie these pills are very trustworthy, but it affect the menstrual cycle of a woman. PLEASE do not use these carelessly. So it's not surprising for periods to be irregular. Wait for some more days and after that consult a specialist or a registered doctor. Please use a condom from today onward. Read this write-up: https://lovematters.in/en/birth-control/chosing-the-right-birth-control/morning-after-pills-instead-of-condoms-is-that-ok If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum