An accidental CT in the first month of pregnancy may have some effect on the fetus, but this is not absolute and requires regular monitoring of the growth and development of the fetus during pregnancy. CT has a certain degree of radioactivity, and the division of the fertilized egg in the first trimester of pregnancy is crucial to embryonic development, so it is possible that having a CT in the first month of pregnancy may cause fetal malformations, growth and developmental abnormalities, or even fetal arrest. However, this is less likely to happen because the radiation level of a single CT is generally not enough to cause abnormal fetal development. It is necessary to observe the development of the fetus at a later stage. Blood tests, amniocentesis and other tests should be performed in the middle of pregnancy, and if the indicators are normal, everything is fine with the fetus. During pregnancy, you should stay away from things that are radioactive, and if you accidentally have a CT, you need to go to the hospital regularly for screening, and if the fetus is normal, you can continue your pregnancy.