Whether or not you need to take aspirin all the time to prepare for pregnancy needs to be strictly prescribed by your doctor, not for everyone. Aspirin is an anticoagulant drug that inhibits platelet aggregation and prevents the formation of blood clots. You may need to take it if you suffer from some thrombotic diseases, or if you are doing assisted reproduction, but otherwise it is usually not necessary to take it. If a woman takes aspirin in excess during the preparation for pregnancy, it may cause abnormalities in the woman’s blood clotting function, manifesting obvious bleeding tendencies, such as excessive menstrual blood, and can even cause anemia, and it may also affect the quality of the eggs and increase the risk of fetal malformations. Women with gastric and duodenal ulcers should take aspirin with caution, women with severe renal dysfunction are prohibited from taking aspirin, taking aspirin may cause women to experience stomach upset or bleeding and other adverse reactions, and need to be taken under the guidance of a professional doctor.