Heparin is mainly used for HCG abnormalities caused by insufficient blood supply to the uterus, coagulation disorders, etc. Generally speaking, after injection of heparin, the time for HCG to come up is about 2-7 days, and the length of time mainly depends on the physical condition of the pregnant woman, the degree of sensitivity to the drug, and the condition of the embryo. If the pregnant woman is more sensitive to heparin, HCG can be turned up about 2 days after injection. If the pregnant woman is less sensitive to heparin or her physical condition is poor, the time for HCG to come up can be extended to about 7 days. In addition, when the quality of the embryo is poor, even if the injection of heparin HCG, the doubling speed is relatively slow, then we have to insist on long-term heparin until the HCG is normal. If the HCG of pregnant women appears to be upturned in a short period of time, that is, the probability of success of fetal preservation is higher, when the embryo is solid for more than 2 weeks, the injection can be stopped; if the HCG is persistently low or does not appear to be normal upturned, it means that there is a risk of miscarriage with poor development of embryo, and it is necessary to prolong the time of heparin treatment or to further formulate the measures to preserve the fetus through ultrasound examination.