Biochemical pregnancy is usually referred to as biochemical pregnancy, also known as insidious miscarriage or subclinical miscarriage, which usually occurs within 5 weeks of pregnancy. A biochemical pregnancy is a condition in which a sperm and an egg combine to form a fertilized egg, but do not successfully attach to the uterus, resulting in a natural termination of the pregnancy state. This often occurs within 5 weeks of pregnancy. After a biochemical pregnancy, patients usually cannot feel any obvious abnormality. Some patients show a delay in menstruation for a few days or an increase in the amount of menstrual blood, while others may experience discomfort such as backache and abdominal pain. If a biochemical pregnancy occurs only once by chance, usually there is no need to treat it or worry about it too much, and normal preparation for pregnancy can be done afterwards. However, for patients with recurrent biochemical pregnancies, they should consult a doctor in time, actively search for the cause of the disease, and carry out targeted treatment under the guidance of a professional doctor.