A progesterone of more than 25ng/ml in a new pregnancy is normal, and a normal intrauterine pregnancy is more likely and less likely to cause a miscarriage. However, the secretion of progesterone is pulsatile, which means that sometimes it decreases, but generally it does not fall below 15ng/ml. If the progesterone is below 10ng/ml the success rate of pregnancy is very low. If the progesterone is less than 6ng/ml, there is no successful pregnancy so far. Therefore, if you have vaginal bleeding after pregnancy, it is recommended to go to the hospital to check chorionic gonadotropin and progesterone, if they are within the normal range, it is not a big problem.