Before stopping heparin sodium in pregnant women, according to the specific disease, blood draws to check antiphospholipid antibodies, D dimer, platelet count, anticoagulant factor Xa activity and other indicators, please refer to the doctor’s diagnosis and treatment advice. In addition to its anticoagulant effect, low molecular heparin also has the effect of immunomodulation, inhibiting the immune response generated by antiphospholipid antibodies, promoting the proliferation, invasion and differentiation of embryonic trophoblast cells, inhibiting apoptosis of embryonic trophoblast cells, protecting the vascular endothelium, and promoting the formation of the placenta. Pregnant women need to stop heparin sodium before according to the specific disease, blood sampling and check antiphospholipid antibodies, D dimer, platelet count, anticoagulant factor Xa activity and other indicators to comprehensively assess. It is important to note that low molecular heparin is not a routine fertility preservation drug. The dosage and duration of low molecular heparin drugs vary according to different indications and needs of the disease, please follow the doctor’s instructions for the specific use of drugs. During the use of the drug, you should closely observe whether there is nosebleed, gum bleeding, skin and mucous membrane bleeding, etc., if there is any abnormality, you should consult the doctor in time.