Question

What is the reason for the absence of menstrual cycles during conception or pregnancy​

Answer 1

Answer:

During pregnancy, all the events of the menstrual cycle stop and there is no menstruation. Menstruation occurs only when the egg that is released is not fertilized. But in pregnancy, the released egg is fertilized and hence the uterus lining does not shed, instead nourishes the fetus.

Answer 2

Answer:-

Because menstrual cycle is the removal of the inner lining of the uterus which is basically there to help prepare the body for the formation of foetus.

If the egg is fertilized then the foetus formation will take place and the inner lining won't shed off thus no menstrual cycle will take place.

Hope it's helps you!!