In the case of not knowing the pregnancy irradiation of chest X-ray, depends on the time of irradiation of chest X-ray, if it is within 14-28 days of pregnancy is not sensitive period, irradiation of chest X-ray in general will not cause embryonic dysplasia or miscarriage phenomenon; but if it is in the menopause of 29-70 days or so, it is a highly sensitive period, this period of time, some of the effects of drugs and X-ray will cause embryonic deformity. So during pregnancy exposure to X-rays, generally speaking, the current dose of radiation are very small, will not cause adverse effects on the embryo, but also need to go to the hospital to find a doctor for consultation and health guidance, in addition to the need for some eugenics examination, oral folic acid, regular pregnancy test.