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If you miss 2 or more active hormonal birth control pills and do not continue with taking pills, you usually should get withdrawal bleeding. If you have continued to take the pills, then the bleeding might not start. If you were sexually active without additional protection after missing 2 or more active pills (and have not followed the missed-pill-protocol), you might be at risk for pregnancy. Wait and watch for your withdrawal bleeding/periods. Visit your doctor gynecologist for further evaluation and assistance.
Take care.