Whether heparin should be used immediately for poor HCG doubling needs to be determined by the actual condition of the pregnant woman. For poor HCG doubling due to coagulation disorders during pregnancy, heparin can be applied appropriately. However, for pregnant women with poor HCG doubling due to reproductive system pathology, the application of heparin is also not beneficial. Heparin is clinically useful to prevent blood clotting and promote local blood circulation, and is usually effective when used in the presence of coagulation abnormalities. Treatment with heparin is more effective in pregnant women with lesions such as thrombosis, hyperlipidemia or immune system disorders with abnormal coagulation. However, women with first pregnancy and coagulation disorders who have a bad doubling of HCG should first have an ultrasound examination. If it indicates normal fetal development, immediate intramuscular heparin injection is not required and aspirin can be taken under medical supervision to promote the blood supply to the embryo. If a woman has had multiple embryonic arrests after previous pregnancies with poor HCG doubling, and the examination reveals that the uterine blood perfusion is poor and the blood is in a hypercoagulable state, heparin should be injected to preserve the fetus to avoid another embryonic arrest. If it is not caused by coagulation dysfunction, but by luteal insufficiency, poor endometrial tolerance, or poor embryonic activity due to abnormal sperm or egg quality, the use of heparin is not effective in this case. Therefore, if there is a bad doubling of HCG during pregnancy, you should first seek medical examination to analyze the specific cause before determining the appropriate treatment, and you should not apply drugs at will.