Anyone had infertility work up?

Tina
Hi there! I'm 33 y.o. and my husband and I have been TTC #3 for a year now and have decided to go see a fertility specialist for an initial consult. We have two daughters who are 7 and almost 3, both took a long time to conceive as I have PCOS and need metformin and sometimes clomid to ovulate. 
Anyone have experience with a fertility clinic? What types of evaluations might they do? 
Really praying for a BFP soon, getting discouraged, multiple pregnancy announcements lately, including my bff who was only casually trying and got pregnant in 2 months.
Thanks!