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Why menstrual cycle does not take ...

Why menstrual cycle does not take place before puberty and during pregnancy ?

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Menstruation occur when the egg is not fertilized. Every month uterus prepares itself to receive the fertilized egg to nourish the embryo, its lining becomes thick and spongy for implantation of the fertilized egg.
In case egg is not fertilized thin lining breaks and discharged out of the body through the vagi in the form of blood.
This condition will not happen before puberty and during pregncy.
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