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"I forgot one pill on day 4 of my JENCYCLA pill pack and started my period the next day. Is this normal?"

Yes, it is possible for missing a pill in your contraceptive pill pack to cause irregular bleeding. It is important to take your pill at the same time every day to maintain its effectiveness. If you have had unprotected sex before or after missing a pill, it may be necessary to take emergency contraception to prevent pregnancy. If you continue to have concerns or experience unusual symptoms, it is recommended to consult with a healthcare provider.