The menstrual cycle is a recurring sequence of physiological changes the body undergoes to anticipate pregnancy. Every month, an egg is released by one of the ovaries which is termed as ovulation. Hormonal changes that take place in the body, prepare the uterus for pregnancy. In case, the egg remains unfertilized during ovulation, it leads to shedding of uterine lining through the vagina, resulting in a menstrual period.