We went to school in medical school when the teacher did not teach this term, common obstetrics and gynecology textbooks in the “abortion” chapter did not mention this concept, I remember the first time I heard this term is to go to work the first year to see the gynecology clinic when listening to a patient, she told me that she found herself biochemical pregnancy, and would like to come to do a comprehensive examination, I weakly asked her what is biochemical pregnancy ah, so she changed doctors. I weakly asked her what is biochemical pregnancy ah, so she changed the doctor …… I was very ashamed, went home to study hard, biochemical pregnancy is the combination of sperm and egg to form a fertilized egg and develop into a viable blastocysts began to implant, the trophoblast ectoderm invades the uterine metamorphosis layer, the embryo secretes β-HCG into the maternal bloodstream and reached a detectable level, after which the β-HCG is secreted into the bloodstream and the β-HCG is released into the maternal bloodstream. The embryo secretes beta-HCG into the mother’s bloodstream and reaches detectable levels, after which, for some reason, the pregnancy does not continue and there is only a transient elevation of beta-HCG in the blood or urine. It is called a biochemical pregnancy because it has progressed only to the stage where it can be detected biochemically and has not progressed to the stage where the gestational sac can be diagnosed by ultrasound. Miscarriage occurs after the blastocysts have settled and formed an embryo, so strictly speaking, a biochemical pregnancy is not a miscarriage. Biochemical pregnancies are often characterized by a delay in menstruation and a slight increase in menstrual flow. They do not require special treatment in the hospital, nor do they affect the next pregnancy, and it is not recommended that they be overly examined or treated. When a mother-to-be comes to the clinic for the first time, I will ask her if her menstrual cycle is regular, and many pregnant women will say that they used to be quite accurate, but not so much during the period when they are preparing to get pregnant, but in fact, they may just have a biochemical pregnancy that they don’t know about.