Combination Pills

How They Work

These pills contain a combination of estrogen and progestin that prevent pregnancy by preventing ovulation, thickening the cervical mucus, or changing the endometrial of the uterus. These pills come in either 21 or 28 day packs.

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When Are They Effective?

Combination pills do not completely protect you during your first cycle. If you are planning of having intercourse during the first week that you start your pills you should use a backup method of birth control because the pills may not protect you from pregnancy during this time.

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Advantages