True menstruation takes place only after ovulation takes place without the occurrence of fertilization. Because oral contraceptives eliminate ovulation, the withdrawal bleeding that happens during the 7 days off active pills is not menstruation.
From Tracee Cornforth, former About.com Guide
Updated: July 28, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
True menstruation takes place only after ovulation takes place without the occurrence of fertilization. Because oral contraceptives eliminate ovulation, the withdrawal bleeding that happens during the 7 days off active pills is not menstruation.
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