Did they put a lead shield in front of you? A chest x-ray is pretty minimal radiation and while it should be avoided during pregnancy unless absolutely necessary, it's actually a lower dose of radiation than an airplane ride. (I am a Radiologic Technologist, not working since I became a mom

) I wouldn't worry too much. I worked in x-ray during my whole pregnancy. I was very careful to wear a lead apron if I had to be exposed to x-rays but I'm sure I did have some exposure and my son is perfectly fine. Hope this helps.