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Delaying your period with hormonal birth control

How does it work?

Traditional methods of birth control — including estrogen-progestin birth control pills, the contraceptive skin patch and the vaginal ring — were designed to be used in a way that mimics a natural menstrual cycle. For example, a traditional pill pack contains four weeks — or 28 days — of pills, but only the first three weeks contain hormones that actively suppress your fertility. The pills for the fourth week are inactive. The bleeding that occurs during the week you take the inactive pills is called withdrawal bleeding. This is your body's response to stopping the hormones.

Withdrawal bleeding isn't the same as a regular period. Nor is withdrawal bleeding necessary for health. This is good news if you use birth control and want to have fewer periods, either for personal or medical reasons.