Low progesterone resulting in a smaller gestational sac is not considered to be recommended for birth control at this time. When a woman is pregnant, the level of progesterone in her body rises, mainly to maintain the pregnancy. At present, the low progesterone value, and the gestational sac has become small, indicating that the development of the gestational sac is not in line with the gestational week, there is a possibility that the fetus will be aborted or spontaneous abortion, so there is no need to carry out abortion preservation in this case. If it is clear that the fetus has stopped, it should be handled as early as possible under the guidance of the doctor, so as to avoid the possibility of coagulation dysfunction that may occur if the late miscarriage is retained for too long, leading to disseminated intravascular coagulation and causing serious bleeding. The common reason for unsatisfactory embryonic development is that the embryo itself is of poor quality; and as childbirth is also a process of survival of the fittest, it is not recommended to carry out abortion preservation when it is clear that the gestational sac has become small. If you have any symptoms of discomfort, you should go to the hospital and consult your physician for guidance.