catscan and pregnancy

CeCelia

discovered a rather large lump on the back of my head followed by a smaller under the skin lump below it. went to the walk in clinic today and she said it looked like a cyst and wanted to make an appointment for a catscan, but since I'm pregnant she wanted me to run it by my obgyn to see if she would agree on it. My appointment is the 18th, but she said if it grows or becomes painful to come back in. she doesn't seem to think there would be any reasons why I can't since it'll just be my head, but I was wondering if anyone else had experience with having a catscan while pregnant?