Heparin injection does not induce rapid doubling of HCG in most cases, and only in some cases can the normal doubling of HCG occur, such as when there are obvious abnormalities in coagulation mechanism, heparin injection can help the normal doubling of HCG. However, as long as the embryo is of good quality and the trophoblast can secrete HCG normally, the HCG can be doubled normally without heparin injection. The purpose of heparin injection is to prevent the occurrence of, for example, embryonic abortion or pre-eclampsia due to abnormal blood clotting. If the patient has tiny thrombus formation in the body, heparin injection can be used to dissolve the thrombus, increase the blood flow to the endometrium and placenta, improve the fusion of embryo and uterus, promote the growth of endometrium, and thus promote the secretion of HCG. doubling of HCG helps embryo growth, and HCG will also double in the case of normal embryo development, so it is important to monitor the blood HCG while applying heparin treatment. If the blood HCG doubling is not good, it may be caused by embryonic dysplasia. It is recommended to continue monitoring and to clarify it by ultrasound examination at the corresponding gestational week. Regular obstetric ultrasound examinations are done to observe the development of the gestational sac and fetal heartbeat in accordance with the gestational week in order to dynamically observe the growth and development of the fetus, which is beneficial to improve the quality of the fetus.