The normal reference range of progesterone at 7 weeks of pregnancy is generally 52.7-100.1 nmol/L. Progesterone levels are highly variable individually and can also fluctuate at different times of the day, so it is necessary to combine other indicators to determine the level of the developing pregnancy sac. The progesterone test is performed mainly by drawing venous blood from pregnant women to check the progesterone level. The progesterone hormone level during pregnancy is related to the degree of normal fetal development and is an important basis for the normal operation of pregnancy. Maintaining a normal range of progesterone can ease the uterus’ sensitivity to contractin and inhibit smooth muscle contraction, thus ensuring healthy fetal growth and development. A decrease in progesterone levels may increase the risk of pre-eclampsia or even miscarriage, which in severe cases may endanger the life of the mother and fetus. Therefore, pregnant women should pay attention to the changes of progesterone value, and if the progesterone value is lower than normal, it is recommended to supplement progesterone and perform fetal preservation treatment. In addition, we should not rely solely on progesterone to determine whether the development of the gestational sac is normal, but should combine it with blood HCG level, ultrasound examination to determine the development of the gestational sac and whether there are symptoms of vaginal redness, etc. to make a comprehensive judgment. In addition, pregnant women in early pregnancy need to pay attention to regular maternity checkups, monitor the progesterone value and changes in fetal movement and fetal heart rate, and seek medical attention in time if there is any abnormality. Pay attention to rest, keep a happy mood, avoid staying up late, have a balanced diet, develop good living habits, and take folic acid supplements on time as prescribed by the doctor.