The ability to conceive after fertilization of the sperm and egg depends first and foremost on the uterus. The uterus is the cavernous organ where the embryo is laid, develops and grows. If a woman suffers from uterine dysplasia or malformation of the reproductive organs, endometrial tuberculosis, uterine adhesions, endometrial polyps, submucosal fibroids, etc., or if the endometrial secretion response is poor due to ovarian luteal dysfunction and insufficient progesterone secretion, the fertilized egg’s implantation, development and growth will be affected. The ability to continue the pregnancy after fertilization of the sperm and egg also depends on whether the sperm and egg themselves are normal. If the embryo has genetic or chromosomal abnormalities; if the pregnant woman is exposed to toxic substances such as cadmium, lead, organic mercury, DDT or other radioactive substances after conception; if the pregnant woman has certain acute infectious diseases (such as viruses, typhoid, pneumonia, severe heart disease, anemia, hypertension, nephritis, etc.), endocrine diseases (such as ovarian luteal insufficiency, hyper- or hypothyroidism, diabetes mellitus, etc.) or the presence of immune abnormalities These factors can cause embryonic death and miscarriage in early pregnancy. Late miscarriages are often caused by parental blood group incompatibility, such as ABO and RH blood group incompatibility. Therefore, not all pregnancies can be carried to term after fertilization of the sperm and egg.