Low progesterone is not necessarily an ectopic pregnancy, and it is only based on the patient’s HCG profile and ultrasound that it can be determined whether it is an ectopic or an intrauterine pregnancy. If the progesterone is low and the HCG in the blood does not double within 48 hours, and the gestational sac is not visible in the uterine cavity until the 40th day of pregnancy and the uterine lining is relatively thin, this situation may be caused by an ectopic pregnancy. If progesterone is low, HCG doubles, and there is a gestational sac in the uterine cavity, this situation may be caused by poor luteal function, you can supplement progesterone in time, so that the fetus may develop normally, and this is an intrauterine pregnancy, there is no need to worry.