Biochemical pregnancy means that the sperm and egg have united, usually the sperm and egg will secrete chorionic gonadotropin after seven days of union, and after another seven days, you can detect it with an early pregnancy test, often the sperm and egg have united and secreted, but they must unite into a fertilized egg, and the fertilized egg has to return to the uterus for implantation, biochemical pregnancy means that the union has occurred, but it has not returned to the uterus for implantation, or it has returned but not for implantation, this is called Biochemical pregnancy. Biochemical pregnancy is a pregnancy without clinical pregnancy, only the blood B-HCG indicates pregnancy, nowadays it is called “subclinical miscarriage”. For those who are familiar with early pregnancy test, please note that a weak positive test can be detected 12 days after ovulation under normal circumstances. The next manifestation is that the color of the test paper will deepen every other day in some cases, while in others, it will deepen significantly every day. If there is no trend of deepening for more than 3 consecutive days, the embryo is usually in trouble. This is generally considered to be due to the poor quality of the embryo itself, or occasional chromosomal variation in the fertilized egg union, or natural eugenics. This is more common in some women who are undergoing IVF. However, most women ignore it as a delayed menstruation because they did not go to the hospital for examination and they do not care about it, but in fact it is already a spontaneous miscarriage. Do not be alarmed if a woman of age encounters such a situation, as it is the result of natural elimination and usually does not affect the next pregnancy. If this happens repeatedly, it is time to go to the hospital for further examination. A biochemical pregnancy is a subclinical miscarriage and should be distinguished from other miscarriages due to illness or accident. In the case of biochemical pregnancy, once in a while, it will not have a major impact. It will return to normal after the menstrual transition and will not affect future pregnancies. A significant decrease in progesterone (PRGE) and human chorionic gonadotropin (THCG), both of which are indicators of pregnancy, along with vaginal bleeding, is diagnostic of spontaneous abortion. Factors affecting the fertilized egg: 1, the fertilized egg itself is defective; (check chromosomes of both sides) 2, the ovarian corpus luteum is not healthy, progesterone secretion is insufficient, endometrial abnormalities, affecting the fertilized egg; (check hormone six) 3, uterine factors: uterine dysplasia, submucosal fibroids, endometrial polyps, uterine adhesions, endometrial tuberculosis, etc. affect the fertilized egg; (hysteroscopy) 4. Immunological factors: In recent years, research on immunological factors has revealed that there are two types of immunological conditions that affect fertilization. a. Homoimmunity: sperm, seminal plasma or fertilized eggs are antigenic substances that are absorbed by the vagina and uterine epithelium and produce antibody substances through immune reactions, so that sperm and eggs cannot combine or fertilized eggs cannot be fertilized. b. Autoimmunity: it is believed that there are autoantibodies to the zona pellucida in the serum of infertile women, which react with the zona pellucida and prevent sperm from penetrating the egg. After the reaction with the zona pellucida can prevent sperm from penetrating the egg, thus preventing fertilization; (blood test for immune antibodies, closed antibodies) 5, Chinese medicine conditioning: if the above tests are normal we should see if Chinese medicine can find the problem; (Chinese medicine conditioning) 6, excessive mental tension, especially severe anxiety due to the lack of pregnancy, excessive psychological pressure. (Relax) What are the significant features of biochemical pregnancy 1, ZZY can be measured to weak positive, but it is difficult to reach positive, much less to strong positive. 2, ultrasound can not see the intrauterine gestational sac. 3, blood HCG value is very low, can only indicate that is pregnant, but can not indicate whether the successful implantation. 4. Generally, the pregnancy will not exceed 50 days and will be spontaneously aborted. There will be grayish white membranous flow out.