I get an ultrasound every 4 weeks... when I was 12 weeks, my doctor told me at my 16 week check up, I would be having a gender reveal scan. 20 weeks is usually when you get an anatomy scan and they can check the gender if you want them to. Calling them wouldn't hurt, but I would assume they would do your scan which would lead to them telling you the gender
You should call & ask them. Cz they would've told you it's you atomony scan
They should have told you.. Call and ask them.
I had my ultrasound scheduled at 18 weeks.