Birth control pills usually start working after 7 consecutive days of use, when they become fully effective at preventing pregnancy. During the first week, it’s still possible to have sex, but it’s recommended to use another form of protection, such as condoms.
As a precaution, some healthcare providers may suggest using condoms throughout the first pack, especially during the first month of taking the pill.
Birth control pills only provide immediate protection if you start taking them on the first or second day of your period. If you begin at another time in your cycle, make sure you’re not pregnant before starting, and take the pill every day for 7 consecutive days before relying on it for pregnancy prevention.
For more information about when birth control pills start working or to get personalized advice on birth control options, talk to a gynecologist or the healthcare provider who prescribed your bill control.