How long does it take for birth control to start being effective?

Combination Pills (COCs)

If you start combination pills within 5 days after the first day of your period, you’ll be protected from pregnancy right away. For example, if you get your period Monday morning, you can start the pill anytime until Saturday morning and be protected from pregnancy that same day.

How long after starting birth control can you stop using condoms?

Don’t take hormone-free days and start a new pack right away. Use a backup form of birth control (e.g., condoms, abstinence) for 7 days.

Why do you have to wait 7 days after starting birth control?

Until the hormones in your birth control pills begin to take effect and create changes in your body, there is a chance you could become enceinte. Therefore, it’s essential to wait for 2 to 7 days, depending on the type of pill you use, or use a backup form of birth control until your pill has time to take effect fully.