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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.
Taken correctly, birth control pills are up to 99.9% effective at preventing pregnancy. Get the facts in this article. Birth Control Pill. Each implant is a plastic rod about the size of a matchstick. The rods contain a form of the hormone progesterone called etonogestrel.