Dear Love, these pills are very trustworthy, so pregnancy chances are not the same after taking it, 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 about your serious headache and saliva problem, it's perhaps fear and nervousness more than anything else. So, please consult a registered doctor about it. https://lovematters.in/hi/resource/safe-sex https://lovematters.in/hi/birth-control/top-10-facts-about-emergency-contraceptive-pills https://lovematters.in/hi/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