Answer:
The menstrual flow results due to
breakdown of endometrial lining of the uterus and itsblood vessels which forms
liquid that comes out through vagina. Menstruation only occurs if the released
ovum is not fertilized.During pregnancy, all events of the menstrual cycle stop
and the corpus luteumsecretes large amounts of progesterone which is essential
for the maintenance of the endometrium. These changes lead to no menstruation,
during pregnancy. Note Lack of menstruation may be indicative of pregnancy.
However, it may also because due to some other underlying causes like stress,
poor health, etc.
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