take gyn's advice OR no time to waste?

quark • 👼🏻mommy`s angel in heaven 9.10.17 | preg w/a 🌈
Hi girls. I went to a new gyn yesterday and Im bummed out. I told them my hubby and I have been TTC since June 2015 with not a single positive hpt. I told him after 12 months TTC my other gyn found a polyp and removed it their surgery and gave us another 6 months to TTC. That was 6 months ago and again nothing. I told him about a positive opk I took in December and he said this meant I was definitely ovulating, and to keep trying for another 6 months before we go to something 'more aggressive'. That will make 24 months TTC without any intervention. I'm 33. 
This is now month 18 of TTC - my gut feeling is that we should have tried something more aggressive after my surgery 6 months ago. The idea of TTC for another 6 months with nothing to show for it, while simultaneously not knowing why just makes me cry. Would it be crazy of me to go back and ask that we start testing for things like blocked tubes, imbalanced hormones _now_?