What percentage of the time do birth control pills work?

Answer According to the Feminist Women's Health Center, oral contraception is effective 92-99.7 percent of the time. Oral contraception is only effective for preventing pregnancy and does not protect agai... Read More »

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How soon do birth control pills work?

The combination birth control pill, which contains both estrogen and progestin, begins working immediately if you take it within five days after your period starts. If you begin using it at any oth... Read More »

Do birth control pills work immediately?

Birth control pills are immediately effective only when started within six days after the beginning of a period. Otherwise, the birth control pill will begin to take effect after a single month (af... Read More »

When do birth control pills start to work?

Birth control pills do not protect against pregnancy for the first full month after use is started. It is recommended to use alternate contraception during the first month of pills as the body adju... Read More »

If someone took 4 birth control pills at one time on accident during first week of pregnancy could it harm the baby?