Progesterone is a hormone that is secreted by the corpus luteum and is used to protect the endometrium of the uterus, and together with estrogen, it maintains the menstrual cycle. At the same time, it can be used together with estrogen to maintain the regularity of female menstruation. In the second half of the menstrual cycle, progesterone continues to be secreted, stimulating the growth of the endometrium, prompting the uterine endometrium to become congested and thickened, and at the same time, it can make the mucus in the vagina become viscous, which is important for regulating the female menstrual cycle, and it is usually insisted on measuring the temperature of the body in a month, that is, it can be observed to see whether it has ovulated or not. If the body temperature rises slightly before the onset of menstruation, then ovulation has occurred. Progesterone stimulates the body temperature to rise, which facilitates the test.