The normal value of progesterone on day 44 is around 25ng/ml, if it is too low it can easily lead to miscarriage. The most common reason for low progesterone in early pregnancy is insufficient luteal function, the corpus luteum is the site of progesterone production, insufficient luteal function will lead to lower progesterone in the body, affecting the stability of the fertilized egg, resulting in miscarriage. Low progesterone requires timely supplementation, mainly oral progesterone capsules or intramuscular progesterone injections, regular blood hormone level checks are needed to avoid accidents, observe whether there is vaginal bleeding, abdominal pain, pay attention to more rest, try to rest in bed, avoid excessive exercise, relax and avoid excessive tension. The fetus is unstable and prone to accidents in early pregnancy. Avoid exposure to harmful substances.