Biochemical pregnancy accounts for 8% to 33% of all pregnancies and 18% to 22% of IVF pregnancies. Biochemical pregnancy refers to the combination of sperm and egg to form a fertilized egg, but miscarriage occurs without successful implantation, also known as insidious miscarriage, the patient usually does not have obvious clinical symptoms, the main manifestation is the delay of menstruation for a few days or menstrual flow is a little heavy. Biochemical pregnancy accounts for 8% to 33% of all pregnancies and 18% to 22% of IVF, but because some biochemical pregnancies do not have obvious clinical symptoms and some patients are not easy to detect, the actual probability of occurrence may be higher. Biochemical pregnancy because the fertilized egg did not bed, not much effect on the endometrium, so the occasional occurrence of a biochemical pregnancy of patients on the next pregnancy does not have a great impact on the normal preparation for pregnancy, but if repeated occurrence of biochemical pregnancy, you should be treated first and then get pregnant.