What is a chemical pregnancy? Biochemical pregnancy means that although the embryo has implanted in the early stage of pregnancy, due to poor embryonic development, the level of HCG (human chorionic gonadotropin) in the blood increases slowly, or the healthy development of the fetus cannot be maintained, so the pregnancy is miscarried very early, and this This kind of miscarriage is not easy to detect, and it requires blood testing or B-ultrasound examination to get accurate judgment. What are the symptoms of chemical pregnancy?