Aspirin is not a regular birth control drug, the main role is mainly anticoagulation and prevention of thrombosis, only in the following cases when you choose to use aspirin for birth control. First, the patient has a pre-thrombotic state, the patient check the coagulation function is abnormal, there is a hypercoagulable state, the use of aspirin can prevent the formation of thrombus, can improve the patient’s hypercoagulable state, which is favorable to the development of the embryo. Because if you don’t use the medicine, there is a possibility of miscarriage or abnormal embryo development or thrombosis. Second, aspirin can also be used when the patient has a history of immune system disease. The use of aspirin for immune system disorders can reduce the immune response of the patient. Therefore, for patients with recurrent miscarriages due to immune system disorders, the use of aspirin after pregnancy can also play a role in preserving the fetus.