Doing ct in the early stages of pregnancy may lead to the occurrence of fetal malformation and even miscarriage. Early pregnancy is a critical period of embryonic development, the embryo in the early stages of pregnancy cell division is fast, and more sensitive to various external stimuli, easy to be affected by radiation, chemical factors. If a pregnant woman in the early stages of pregnancy undergoes a ct examination, the radioactivity of ct is relatively large, which may lead to fetal deformities or even trigger a miscarriage. Pregnant women should try to avoid contact with radioactive substances during pregnancy, such as ct examination, x-ray examination, etc. In addition, it is necessary to reduce the exposure to chemicals and irritating gases, in order to prevent the growth and development of the fetus from being adversely affected. If you have to have an examination, you can choose the examination methods that have no effect on the fetus, such as ultrasound. Early pregnancy ct may lead to fetal malformation, but may not have any effect, need to regular obstetric examination, the detection of abnormalities to be clear.