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Hi, You can start taking Birth Control whenever you wish but you must never miss a dose as this will increase your chances of pregnancy. If you want your period to arrive on the same date then take your birth control on the 1st day of your period. You must continue to take birth control everyday and not miss a pill. If you miss a pill or several pills then you're at risk of pregnancy and you must always use a condom for 2 weeks when you miss one or more pills. Birth control does not reach its full effectiveness until you've been taking it for one month and you've received your 1st period while on birth control.

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Q: Is birth control effective if you start taking them before your period actually begins and not the last day of your period?
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