Pregnant women who have bad HCG doubling should decide whether to use heparin or not depending on their situation. If the bad HCG doubling is caused by problems with coagulation, it is possible to use heparin appropriately. However, if it is caused by other factors, there is no benefit of heparin. Heparin promotes blood circulation and prevents the occurrence of blood clotting. Heparin can be given to pregnant women who have abnormal blood clotting. If women with coagulation disorders have a bad doubling of HCG, they should go to a regular hospital to check the ultrasound, and if the ultrasound results show that the fetus is normal, then they can use heparin, or they can take aspirin, and they need to listen to the doctor’s advice. If the embryo is already in the case of embryonic arrest, the HCG doubling is not good, at this time to play heparin is also useless. It should be noted that if a pregnant woman has a bad HCG doubling due to abnormal luteal function, egg quality, etc., the use of heparin is not recommended and is not effective. Therefore, if a pregnant woman has a bad HCG doubling, she should go to a regular hospital for a professional examination to clarify the cause and then targeted treatment, and should not use drugs arbitrarily.