We couldn't access your location, please search for a location. Talk with your nurse or doctor about the best time for you to start taking the pill. So in reality, 9 out of pill users get pregnant each year. Sperm can live in a woman's body for 5 days after sex. But if you decide the pill is right for you, make sure you take them on time for the best effectiveness. Have a chat with your healthcare provider about which back-up method is right for you, and remember: What are the different types of birth control pills? They may contain iron or other supplements that help you stay healthy. If effectiveness is the most important thing to you when picking what birth control to use, you might want to check out IUDs and the implant. Types of Emergency Contraception What is the difference between emergency contraception, the "morning after pill", and the "day after pill"? But other things, like having vomiting or diarrhea for more than 48 hours may reduce how well the pill prevents pregnancy. You can start taking the progestin-only pill right after an abortion, miscarriage, or childbirth. It may take time to get a prescription and fill it, or find a pharmacy that carries EC, so call your doctor or pharmacy as soon as possible after unprotected sex. And perhaps most importantly: You can use a brand of pills that has 3 months of active pills in a row so you only get your period 4 times a year. However, when you start taking your pill could affect whether or not you need to use a backup birth control method like condoms for the first 7 days. I missed a pill.