Duration of menstrual cycle
Explain the normal duration of menstrual cycle? How does method of the calendar contraceptive work?
Expert
Normal duration of the menstrual cycle is 28 days though it may vary among several women or in different cycles of same woman. In calendar contraceptive method, the date n-14 (n minus 14) is used, where n refers to the number of days of normal menstrual cycle of woman (generally n=28). The safety margin +3 or –3 are the days around n-14 in which the intercourse must be avoided in order to avoid pregnancy. (This method is not exempt from failures. A doctor should always be consulted before relying on any of the contraceptive method.)
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