Please help!

Carmel • First time mom!
I paid for my first ultrasound out of pocket 125$
But now I get a bill saying I owe 212$ for that ultrasound and when I called they said that its for the ultrasound reading?
They are saying that I paid on the spot for the ultrasound but by federal law they need to send my ultrasound results to a radiology speacilist for a reading. Without me knowing or agreeing. This is the first I hear about this! Not my doctor or my clinic have told me about this! 
Anybody else have gone through something like this??? I really need help with this!