The embryo is a rapidly developing/dividing cell system. This makes it sensitive to radiation, especially in the first trimester. A significant dose could increase the incidence of congenital (existing from birth) abnormalities by 1% over the natural incidence. It is proven that radiation in utero is harmful but it should be noted that the probability of this occurrence is small. If you are pregnant, think you may be pregnant, or are trying to become pregnant, PLEASE, notify the technologist before your exam takes place. That way an assessment can be made of your specific situation to determine any risk to an unborn child. If it is decided that the risk is too high, then you may be asked to come back at a later date for your x-ray examination.