There are certain risks associated with taking medication during the 40th day of pregnancy, which may lead to the occurrence of embryonic arrest, spontaneous abortion, fetal developmental malformations, etc., with an increased chance of abnormalities. Between 3 and 8 weeks after fertilization is a critical period for the development of the fetal organs. 40 days of pregnancy, which is 3-4 weeks after fertilization, may have a negative impact on the growth and development of the early embryo if sedative drugs, anti-tuberculosis drugs, and antibiotic drugs such as quinolones are taken during this period. The doctor will evaluate the type of medication taken and the development of the embryo accordingly. When embryonic abortion or spontaneous miscarriage occurs, forcible preservation of the fetus will not be successful. If a woman is 40 days pregnant and needs to take medication according to her condition, she should be evaluated by a doctor before deciding, and should not take medication on her own.