Low progesterone in a new pregnancy is prone to miscarriage with aura or fetal arrest, generally to supplement progesterone or termination of pregnancy treatment. 1. Supplemental progesterone, low progesterone in a new pregnancy to check the blood HCG and embryonic development, such as HCG doubled good, embryonic development is normal, just a low value of progesterone, can be taken under the guidance of the doctor or injected with progesterone to give fertility preservation treatment, and pay attention to the value of the follow-up of the progesterone and the development of the embryo. 2. Termination of pregnancy, such as checking the HCG doubling is not good, can not blindly preservation of pregnancy, should be combined with ultrasound to determine whether ectopic pregnancy caused. If there is ectopic pregnancy caused by low progesterone, can follow the doctor’s advice to give mifepristone, methotrexate tablets conservative treatment or surgical treatment. In addition to exclude ectopic pregnancy should also check the embryo development, such as HCG doubling is not good, the embryo appeared to stop the development of phenomenon, can not blindly supplement progesterone, need to terminate the pregnancy in time, and check the causes of fetal arrest and give symptomatic treatment.