X-ray should not be considered during pregnancy as far as anybody can help it, but if there is a necessity to do an X ray (e.g. look up for abnormality) then typically x-rays are very safe. For example, x-ray of the chest produces a 0.5 unit of radiation, and you need about 50 units to hurt the baby. If you can help it, don't do it. If you need to do it, go ahead. When doing an x-ray, the radiologist will give you a pad to cover the parts that are not undergoing x-ray.