Can a pelvic ultrasound cause internal bruising? I had one on Tuesday due to my OB not being able to locate my IUD. Her office machine is old so she still couldn't see it. So the following day I had to go to radiology and have a better pelvic u/s done. It didn't really hurt at the time, but afterwards I was very sore on the inside of my lower stomach. It is now Friday and I am still sore. Is this normal? Could there be internal bruising?