After having a CT examination and finding out that you are pregnant, it may have an effect on the fetus.CT is a radioactive operation, which is prone to cause fetal malformation or miscarriage, especially in the first trimester of pregnancy.However, the dose of the CT examination is much smaller than the teratogenic dose, and the specific effect needs to be observed at a later stage.If the pregnancy is to be continued, the related risks need to be clarified, and the obstetric examination should be conducted on a regular basis. CT examination is a tomography scan of the human body through X-ray, which has a certain degree of radiation. The first trimester of pregnancy is a critical period for fetal development, and accepting radiation-based examinations at this time is likely to lead to fetal malformation and development. However, the radiation dose required for a CT examination is much lower than that required to cause fetal malformations, and preservation of the fetus may be an option, but the associated risks should be clarified. If the CT examination is performed before fertilization, there is essentially no effect on the fetus because the egg cell is far less affected by radiation than the fertilized egg. If a CT examination is performed after the formation of a fertilized egg, it is likely to cause fetal malformations or miscarriage, and continuation of the pregnancy is generally not recommended. If there is no early miscarriage, you should do regular and good maternity checkups according to the doctor’s requirements during pregnancy, especially the mid-term detector tests, including Down’s syndrome screening, 4D ultrasound, fetal heart ultrasound, etc. If they are normal, there is no need to be particularly worried. From the perspective of eugenics, it is suggested that during pregnancy, try not to carry out examinations with radiation, minimize the probability of exposure to radiation, and try to prevent the possible effects of radiation accumulation on the growth and development of the fetus.