If the egg has not been fertilized, the increase in progesterone and decrease in estrogen, forcing the egg to be expelled.
What hormones change during menstruation?
It is known that in the premenstrual period there is a drop in serotonin levels. The second important factor to cause PMS is the hormonal change that occurs in the second half of the menstrual cycle, with an increase in progesterone and a decrease in estrogen.
With this information, we can conclude that if the egg has not been fertilized, the increase in progesterone and decrease in estrogen, forcing the egg to be expelled.
Learn more about progesterone in brainly.com/question/14364537
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