Below 15ng/ml of progesterone, the chances of embryonic abortion are significantly increased. Progesterone is a progesterone secreted by the corpus luteum of the ovary and represents the level of progesterone in the body. Progesterone works together with estrogen in the body to promote endometrial development, facilitate embryo implantation, prevent uterine contractions and maintain pregnancy stability. During early pregnancy, progesterone shows a steady rise as the duration of pregnancy increases. Pregnant women with normal progesterone levels have a significantly lower probability of miscarriage and embryonic abortion. If progesterone is low, the body’s progesterone level is insufficient, which can easily lead to embryonic abortion. In addition, low progesterone is also a sign of a poorly developed fertilized egg. Pregnant women with low progesterone can be treated with progesterone supplementation, and the level of progesterone and fetal development need to be monitored dynamically during the treatment.