Low progesterone after transplantation is mainly related to the type of medication used for luteal support. If the progesterone used after the transplant is inotropic, the progesterone in the blood should not be too low, if the progesterone used is vaginally inserted certolone or Angiotensin, or oral dydrogesterone, the value measured in the blood of these drugs will be very low, so it is not necessarily the real progesterone level is low, in this case it is not too relevant, do not worry. After the transplantation, we see the success of IVF mainly by the doubling of the blood HCG value and whether there are fetal buds and fetal hearts in the ultrasound, while the progesterone level is not a particularly important factor, and if the progesterone is low, it is not necessarily abnormal, so some patients always repeatedly go to the progesterone test, worrying that the embryo does not lay, worrying that the fetal heart is gone, but in fact this is not necessary.