If a test is done during pregnancy and a progesterone result is found to be low, it indicates that there is insufficient luteal function in the body or the embryo itself has chromosomal abnormalities, which can easily lead to preterm miscarriage and also to embryonic abortion. If the progesterone result is below 15 nmol/L, it is also necessary to rule out the presence of ectopic pregnancy. Generally, if progesterone is low, progesterone supplementation is needed. In terms of medications, progesterone preparations can be used intramuscularly, orally with dydrogesterone, and also vaginally with progesterone suppositories. You must pay attention to rest, avoid strenuous exercise, prohibit sexual intercourse, and have regular follow-up examinations.