The menstrual bleeding that occurs when a woman is taking the drug-free pills in an oral contraceptive pill pack is the result of

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The menstrual bleeding that occurs during the period when a woman is taking the drug-free pills in an oral contraceptive pill pack is due to a decrease in estrogen and progestin levels. These hormone levels drop because the active pills, which contain synthetic versions of estrogen and progestin to prevent ovulation, are not taken during this phase, leading to withdrawal bleeding similar to a menstrual period.

The Menstrual Bleeding That Occurs When a Woman Is Taking