How do oral contraceptives, specifically birth control pills, prevent pregnancy?
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There are many different kinds of birth control pills available, and new options are available often. Most work by releasing hormones that keep your ovaries from releasing eggs. The hormones also thicken your cervical mucus, which helps to block sperm from getting to the egg in the first place.
Types of pills:
Combination. Combination pills use two types of hormones –estrogen and progestin- to prevent ovulation. A monthly combination pill pack contains 3 weeks of hormone-based pills and a week of hormone-free pills. You will take the hormone-free pills while you wait for your period each month.
Progestin-only. These pills have no estrogen in them and are often recommended if you cannot safely take estrogen, or if you have side effects from a combination pill. They release a small amount of progestin every day of the month and do not give you a period during a set week.
For more information you can visit findmymethod.org website.