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Birth Control & Women's Health

How Do You Know If Your Birth Control is Working?

Faith Coleman

Medically reviewed by Faith Coleman, University of New Mexico School of Medicine on August 21st, 2026.

The most reliable sign that a hormonal oral contraceptive (birth control pill) is working is the absence of pregnancy. For combined hormone pills, you should experience monthly withdrawal bleeding during your pill-free (or placebo) week. However, some women may have lighter periods or no bleeding at all, which can still be normal. Missing two consecutive periods while on birth control pills warrants a pregnancy test. Non-hormonal contraceptive methods (e.g., condoms or diaphragms) don't usually change the timing of your menstrual cycle, so tracking your natural menstrual pattern helps identify any irregularities. Studies show that when used exactly as directed, birth control pills are over 99% effective at preventing pregnancy.

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