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Combined oral contraceptive pills provide effective contraception from the very first pill if started within five days of the beginning of the menstrual cycle (within five days of the first day of menstruation). If started at any other time in the menstrual cycle, the pill provides effective contraception only after 7 consecutive days use of active pills, so a backup method of contraception must be used until active pills have been taken for 7 consecutive days.
|Includes CC-BY-SA content from Wikipedia's Combined oral contraceptive pill article (authors)|