Getting really annoyed we haven't had the Anatomy ultrasound yet... 20 weeks already-- RANT

I had an appointment with my midwife a couple weeks ago and she gave me two different options of where we could have our ultrasound. I picked a place and she told me she'd send over my information and they will give me a call and schedule me. It's been about 3 weeks and I haven't received a call yet. I wasn't 20 weeks at the time so I wasn't sure if they're the kind of office that requires you to be at 20 weeks. I haven't contacted my midwife yet because I've been busy with other things but I'm just really annoyed and disappointed that I have to deal with all this anticipation!!