Needing advice!!!

Hey, girls! 8/20 is my fourth doctor’s appointment for fertility. (I go every three months). So far, she’s tried Metformin, Clomid, and Letrozole. For anyone else who has done treatments, is there a certain amount of time before I can request further testing? She gave me a pap the first time I went, but nothing since then. And she just keeps pushing pills that aren’t working in the slightest. I have PCOS, and have regular periods, I just don’t ovulate. Nothing has helped and I really wanna make sure my tubes aren’t blocked or anything but don’t know if I’ve been trying pills long enough or not. Any advice would be great!