Whether or not having an X-ray has any effect on pregnancy is related to the number of chest x-rays done, 1 time usually does not have much effect, multiple exposures can have an effect on pregnancy. X-ray examination usually refers to a means of examination under X-ray irradiation, imaging on a fluorescent screen, it will be absorbed in the penetrating body, we use the absorption of the different and take in the intensity of the image, which forms an X-ray film. Radiation has an action threshold, under this dose, no harm to the human body, more than the threshold, the degree of damage is proportional to the dose, the International Commission on Radiological Protection that in the fetus absorbed dose is less than 100mGy (1Gy = 1001 roentgens), that is, 10 roentgens of the case, generally does not pose a hazard to pregnancy. Ordinary X-rays are in the range of 0.1-0.2 roentgens/times, and if only a chest X-ray is done, the radiation dose received is equivalent to 1/100-2/100 of the threshold, which will not affect the fetus, and there is no need to delay the preparation of the pregnancy, whether the man or the woman has undergone an X-ray or a CT examination. If you have a medical condition that requires repeated chest X-rays within a short period of time, it is recommended that you delay pregnancy preparation. During the preparation period, women can take folic acid tablets under the guidance of the doctor to prevent the occurrence of fetal neural tube malformation after pregnancy. Meanwhile, during the preparation for pregnancy, the diet should also pay attention to comprehensive nutrition, eat more vegetables and fruits, and avoid exertion.