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1 Start your pills today. 2  If you start your pills today, you should use a backup method of birth control (condoms with spermicide) during the first 7 days of the pill package. 3  Birth control pills will start to protect you from pregnancy after the first week, if you take them correctly.
EC pills work by preventing or delaying ovulation and preventing sperm from fertilizing the egg. You can use EC right away or up to five days after sex. The sooner you use it, the better it works. There are a bunch of EC pills currently on the market in the U.S. that are made with the hormone levonorgestrel. If you take EC pills within 24 hours after sex, they reduce your risk of pregnancy by up to 95%. Overall, they are 89% effective, meaning they prevent about 7 of 8 pregnancies that normally would have occurred. There are several side effects that you may experience when using an EC pill.