Question

why is menstrual cycle does not take place before puberty and during pregnancy​?​

Answer 1

If pregnancy doesn't happen, your body doesn't need the thick lining in your uterus. Your lining breaks down, and the blood, nutrients, and tissue flow out of your body through your vagina. Voilà, it's your period! If you do get pregnant, your body needs the lining — that's why your period stops during pregnancy.

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Answer 2

Answer:

if pregnancy doesn't happen, your body doesn't need the thick lining in your uterus. Your lining breaks down, and the blood, nutrients, and tissue flow out of your body through your vagina. Voilà, it's your period! If you do get pregnant, your body needs the lining — that's why your period stops during pregnancy.