I wanted to avoid ultrasounds to avoid unnecessary risk/intervention. Ended up having two necessary ones, and but they were needed so I accept them.
My midwife recommended one ultrasound to determine age because it is unsafe for a babe younger than 36 weeks to be born at home. I thankful for that test, because babe was conceived 3 weeks earlier than I thought. I had another ultrasound at 33 weeks because I was running and fell smack on belly. Went to the hospital and had a scan to make sure babe was okay.
Here is an article my midwife's sent when I suggested an unnecessary ultrasound for my mom's peace of mind:
Q&A: Is ultrasound safe? https://www.facebook.com/note.php?note_id=119886503978
I trust that my midwife would have recommended ultrasound if there was reason to be concerned.