Progesterone 8ng/ml more than six weeks pregnant, belongs to the manifestation of low progesterone, the success rate of fetal preservation is relatively low, but the specific whether the success of fetal preservation, clinical no clear instructions, depending on the individual situation and the size of the gestational sac and HCG value. Under normal circumstances, the value of progesterone can reach 20 ng/ml at 6 weeks of pregnancy, if the index is only 8 ng/ml, it is a manifestation of low progesterone, in this case the success rate of fetal preservation is relatively low. However, some women in the occurrence of preeclampsia, the gestational sac changes have not been affected, and HCG levels have not continued to decline, then this situation still has a chance of successful abortion preservation, but should be evaluated in conjunction with the individual situation. In order to preserve the pregnancy, progesterone should be injected as soon as the preeclampsia is detected, and this should be done under the guidance of a medical professional.