First ob visit and i am really anxious, help?

Ok i am like 19+ weeks along and I am finally going to see an ob in a couple days for the first time. I am so anxious Because I don't know what to expect at all. I have never had an ultrasound/sonogram and I am worried I still won't get one. I know I'm far enough along to see the of the baby and I want to know. Does anyone know what the chances are that I will or won't get a u/s done when I go? What else should I expect, aside from weight, blood testing, and checking for adima and vericose veins?