Heather,
When you go and you're called in or whatever they will weigh you on their scale, and have you take a urine test....(which the nurse will take a pg test on you using your urine before she comes into the room you're in), then you'd probably go into the room and the nurse will come in and ask you some questions, give you a pamphlet of what medications you can take while pregnant, list of numbers to contact nurse, gyno...and just some stuff like that, she'll take your blood pressure, and she'll leave so you can change, nurse and gyno will knock on door and come in when you tell them its ok to, gyno will check you down there...then leave so you can get changed back into your clothes....then gyno comes back in and talks to you for a 'lil bit and then the nurse will take some blood from your arm and that's pretty much it....one you're done with all that you know you go to front desk and they'll ask when you want to schedule your next appointment.
(I don't know if every Doctor does the exact thing but that's what I had to do at my first gyno appointment since becoming pregnant).....
Hope this helps!