Anyone else opting out of all ultrasounds?

We will be opting out of all ultrasounds this go around. The benefits of seeing little one doesn't outweigh the risks to us. Most babies don't like it and you will see them run away from the screen. Some research suggests that ultrasounds might be one part of the cause for autism and already having a child on the spectrum I would like to do anything I can to lower that risk if I can. Just wonder if anyone else is doing things outside the norm. *We will do a ultrasound if medically necessary.