#Menstruation is a monthly shedding of a female's uteral lining; it lasts about 3 to 5 days (average) and contains blood and tissue that exits her body through the cervix and vagina – the first day of menstruation is the first day of your period.
#The menstrual cycle is the recurrent approximately monthly menstruation.

#The menstrual cycle is the hormonal driven cycle; day 1 is the first day of your period (bleeding) while day 14 is the approximate day you ovulate and if an egg is not fertilized, hormone levels eventually drop and at about day 25; the egg begins to dissolve and the cycle begins again with the period at about day 30.

Hormones are released by the pituitary gland in the brain to stimulate the ovaries during the reproductive cycle. These hormones cause some of the woman's eggs, which are stored in the follicles of her ovaries, to start to grow and mature.
The follicles start producing a hormone called estrogen. The increased estrogen causes the womb lining to become thicker in preparation for receiving a fertilized egg. If the egg got fertilized then women gets pregnant
If the egg is not fertilized, estrogen and progesterone levels will drop, and the lining of the uterus (endometrium) will start breaking dow