It needs to be injected for 7-8 weeks after successful embryo transfer. If the fetus is stable by ultrasound, the injection can be stopped, if the fetus is not stable, it is recommended to continue the injection. Heparin, or sodium heparin, is an anticoagulant drug and has the effect of preserving the fetus. Most women need to inject heparin after IVF transplantation, which can improve the blood circulation of the endometrium, so that the embryo can be better laid, and can also promote fetal development and so on. As each woman’s physical condition is different, the exact time of heparin injection is also different. Most women can take heparin injection for 7-8 weeks, and if the ultrasound shows that the fetus has developed and stabilized, the heparin injection can be stopped; if the fetus is unstable or there are signs of miscarriage, the heparin injection needs to be continued. It is recommended that women should keep their mood happy after transplantation, take more rest as appropriate, avoid strenuous exercise or heavy physical labor, and also pay attention to their own conditions and take regular maternity checkups.