Pregnancy biochemistry, i.e. no clinical pregnancy, is a phenomenon in which the fertilized egg does not successfully implant in the uterus and miscarries along with menstruation, so pregnancy biochemistry can also be called subclinical miscarriage. Although the urine HCG test is positive or the HCG is >25U/L, the gestational sac is not visible during the ultrasound examination. The cause of biochemical pregnancy may be due to poor quality of the fertilized egg or aging of the egg that united with the sperm, resulting in failure of implantation and leading to biochemical pregnancy, which does not cause damage to the uterus. Patients can follow the normal menstruation treatment, wash the vulva with warm water every day, keep the local clean and dry, and change clothes regularly, mainly loose and breathable. It is recommended not to eat spicy and stimulating food, reduce all stimulating factors, maintain a calm state of mind and prepare for the next pregnancy.