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days before yazmin is effective?

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when begining yazmin birth control pills do many days before they become effective

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replied March 30th, 2011
Birth Control Answer A21429
Welcome to ehealthforum,
Most of the hormonal contraceptive patches usually start being effective after 3-4 weeks of regular use (without missing any pills in between). You can start being sexually active after you get your periods and start with the second pack of birth control pills. If having intercourse before this time (while being on the first pill pack of use), use back-up/additional protection to remain protected against pregnancy. For more details, discuss with your treating gynecologist.
Take care.

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