The first function of the uterus is to produce menstruation. Under the influence of estrogen and progesterone, the uterine lining is periodically exfoliated and bleeds, which leads to menstruation and reflects whether the endocrine secretion is normal or not. Another major function of the uterus is to produce a fetus. Every month, a woman emits an egg, and after ovulation, the egg is picked up by the umbrella of the fallopian tube and enters the lumen of the fallopian tube, where it is waiting for fertilization. The fertilized egg will begin to implant in the uterine cavity and only if it implants in the uterine cavity can it be said to be a normal intrauterine pregnancy, that is, a normal pregnancy. Only if the pregnancy is in the uterine cavity can it reach full term and give birth to a normal newborn. If the fertilized egg implants anywhere other than in the body cavity of the uterus, the pregnancy is said to be ectopic. If the uterus is removed, the fertilized egg cannot enter the fallopian tubes, cannot be laid, and cannot conceive normally.