Ultrasound Question...

Mi
I have my first appointment on January 22nd, at which time I'll be about 6.5 weeks along. I called to ask if I'd get an ultrasound at my first appointment and the woman said the first appointment is just to confirm the pregnancy and an ultrasound would be a separate appointment, usually between 6 and 8 weeks along. I asked if I would be able to request one since I have had a MMC in the past. She said if the doctor thinks it's necessary they'll order one. 
To me that sounds like they don't perform the ultrasound in office. Is that normal? Who typically performs the ultrasound and where is it done? 
Thanks so much!!