anyone else not getting ultrasounds done??

Zed
First pregnancy and I'm a bit paranoid about the dangers of ultrasounds on the baby. I'm thinking maybe the 20 week one to make sure everything is growing properly or maybe one closer to due date to make sure everything is okay for birth. 
I am wondering is there any other women out there opting not to have the earlier ultrasounds? Do you ever worry its just a phantom pregnancy? What are your experiences?