The drug heparin has the benefits of improved blood circulation and high safety when used for fetal preservation, but has the disadvantages of adverse effects such as osteoporosis and thrombocytopenia. Heparin belongs to a kind of anticoagulant, can be used in pregnant women’s birth control, when using heparin, pregnant women’s blood circulation can be improved, for the fetal instability of pregnant women is more suitable, in the clinical application of more, the safety is relatively high. However, when using heparin, it is necessary to pay attention to the possibility of blood system abnormalities, osteoporosis, transaminase elevation and other adverse reactions, for acute gastroduodenal ulcer, coagulation disorders, active cerebral hemorrhage, allergies and other conditions are not suitable for use. If there is any fetal abnormality, you need to go to the hospital in time, take reasonable methods of treatment under the guidance of the doctor, and avoid the unauthorized use of heparin. Pregnant women should pay attention to the prenatal examination during pregnancy, actively listen to the professional doctor’s advice to do a good job of comprehensive care and health care, pay attention to more rest, at the same time, should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.