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2015-11-20T15:46:00+05:30

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if the egg is not fertilized then the lining of the uterus breaks down and get released in the form of blood through the vagina . this is the reason for menstruation . but in pregnancy since the the egg get's fertilized and the lining of uterus does not break down . therefore in pregnancy there is no menstrual cycle .
              i hope it helps...............................^_^
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