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Hi Daisy, Thank you for your question and welcome to Empowher. Postinor should only be used as an emergency contraceptive and not as a form of birth control. You said that you took it three days in a row? Have you talked to your doctor about this? Mercillon is a daily pill used for contraception that appears to be more in the arena that you should be using since you are looking to have birth control. Since you are taking both pills, you should get your doctors opinion on what you should do next. Unfortunately, we cannot diagnose or prescribe anything for you. You must get your treating physicians opinion on your question. Please keep us posted. Missie February 15, 2014 - 5:56am