I started off by going to my gp. She did blood tests for immunities and checked everything also ordered an ultrasound for me to check for pcos and ordered a sperm analysis for my DH. Turned out I do have pcos and so she referred me to a gyno and treated me with metformin in the meantime. Then at the gyno I got scans and blood tests again to confirm pcos and then I got prescribed clomid. I did 4 rounds and still haven't gotten pregnant so I decided to give up. I was lucky my gp was very understanding, I hear a lot of gps won't start investigating until you've been ttc at least a year.
Have you been charting your temperatures? Is your cycle regular or all over the place?