It is normal for a woman to have a clinical progesterone value of 20 to 40 ng/ml at 34 days of pregnancy. Progesterone values less than 20 ng/ml should be judged in conjunction with HCG values. If the HCG doubling is poor, it is important to closely observe if there is abdominal pain, bleeding and other manifestations of preterm abortion. If the progesterone value is greater than 40ng/ml, it means that the embryo is developing well. In the early stage of pregnancy, progesterone needs to be synthesized by the female corpus luteum and ovaries because there is no placenta growth. It is recommended that women should have more progesterone checks and closely observe the changes in progesterone level. Because low progesterone is not conducive to the growth of the fetus and even prone to vaginal bleeding, abdominal pain and other symptoms of preterm abortion, progesterone or dydrogesterone can be taken under the guidance of the doctor for fetal preservation treatment, and women are advised to closely observe the changes in HCG values.