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Regular birth control pills have been designed to let you have withdrawal bleeding/periods similar to your menstrual cycles (resembling normal hormonal and period pattern), and hence starting with periods late while being on the placebo pills does not affect the efficacy and is considered to be normal as long as you do not miss your periods/withdrawal bleeding. Continue to take the birth control pills at scheduled time daily and avoid missing active pill intake. If still worried, you may consider visiting your doctor/gynecologist for further evaluation, clarification and assistance.
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