Biochemical should refer to biochemical pregnancy, which does not require menstruation. Biochemical pregnancy is a spontaneous abortion that occurs between the last menstrual period and the next menstrual period. The sperm-egg binding time is shorter, and the fertilized egg is discharged from the body without being deposited and developed. Clinical manifestations are a transient increase in blood HCG and vaginal bleeding like menstrual flow, but the body does not experience a real pregnancy, there is no harm to the body, so biochemical pregnancy does not need to sit for a month. Biochemical pregnancy is mainly related to chromosomal abnormality of the embryo, maternal factors, environmental factors, etc. It is the result of poor development of the embryo and the body’s natural elimination, and generally does not require special treatment after the occurrence of biochemical pregnancy. However, women with reproductive requirements should be carefully examined when preparing for pregnancy again to rule out pathological factors and prevent biochemical pregnancy from occurring again. It is recommended that both husband and wife go to the hospital for a pre-pregnancy eugenics health checkup to assess whether the body is suitable for pregnancy; quit smoking and drinking, develop good living habits, and don’t stay up late. Moderate exercise to maintain physical health, to avoid prolonged exposure to radiation or pollution in the environment, to get rid of toxic and harmful work environment. Keep a happy mood and avoid heavy physical labor.