I dont know how it works in the US,but here,they always start with bloodwork and go from there.The bigger tests are usually left for last (tests like HSG etc).
My first OB visit was ok.I had a pap and a full check up,then I mentioned that I had been TTC for 4 months and didnt think I was ovulating etc.
(Im 29 and also have 2 kids who are 7 and 10 years old).
Last month I was put on Clomid.I was in my 6th month of TTC.I think that doctors tend to make you wait things out if you dont say anything..so if that happens,dont be affraid to speak up and ask for (or suggest) certain tests etc.
In my case,my OB co-operated amazingly with me once she realised how much I understood on the subject and that I wasnt willing to go home without an awnser

Do you chart? If so,take them with you..
Good luck!