It's normal to feel a bit traumatized for any invasive procedure. I had a stomach scope and none of their stupid sedation worked with me. I remembered and felt everything. It was awful. I was upset about it for awhile.
But I've had many transvaginal and abdominal ultrasounds and found the abdominal ones exponentially worse because of the 'full bladder' requirement which is pretty painful for me after 3 c-sections. Transvaginal ones didn't bother me. But you know what? I'm not going to belittle someone who felt raped after one. When you have ACTUALLY been raped, there can be different triggers for everyone (I just happen to have different triggers). Not cool to invalidate someone else's feelings about it.