Listen Ronney puttar, YES, it interfere the menstrual circle - p2 is an emergency pill that is taken after unsafe sex, the sooner it is better, but it can affect a woman's menstrual cycle. Please don't use these pills carelessly, condoms are used for safe sex and not emergency pills. And these pills are very trustworthy, so pregnancy chances are not the same after taking it, but if you have any doubts, take a home pregnancy test and make sure of the situation. Read here: https://lovematters.in/hi/resource/safe-sex https://lovematters.in/hi/birth-control/types-of-birth-control/emergency-contraception https://lovematters.in/en/news/one-emergency-pill-enough 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