Symptoms of low progesterone in early pregnancy include abdominal pain and bloating, vaginal bleeding, and fetal growth retardation. A pregnant woman with a progesterone value of less than 20ng/mL is considered to have low progesterone. Normal progesterone level can ensure normal implantation of fertilized egg and normal development of the fetus, and it can also promote breast development and prepare for breastfeeding. If progesterone is low, pregnant women will show vaginal bleeding, abdominal pain and bloating and other discomforts, in addition to fetal growth and development will be delayed, or even fetal arrest, miscarriage. Low progesterone can be directly supplemented by taking progesterone capsules or direct intramuscular injection of progesterone. Low progesterone should go to the hospital in time, under the guidance of the doctor for fertility preservation treatment, in addition to regular monitoring of the value of progesterone, to observe the development of the fetus, to ensure the normal development of the fetus.