It is possible, but not certain, that a chest X-ray taken more than 10 days into the pregnancy will have an effect, and this will have to be determined by the subsequent development of the fetus. Generally speaking, if you receive a small amount of chest X-ray dose exposure in a single session, the effect on the fetus will not be very large, and if it is before the fertilized egg has fully implanted, then consider the effect even smaller. However, caution is needed in all examinations during pregnancy. If after the chest X-ray, the pregnant woman experiences abnormal vaginal bleeding or the ultrasound shows abnormal fetal development, then it is recommended that follow-up treatment is required as prescribed by the doctor, and if necessary, the pregnancy can be terminated. During pregnancy, it is recommended to avoid environments that contain radioactive substances, and it is best to undergo regular obstetric examinations.