Next steps.. help please!

K

Hi all- TTC #1 for 16 months. Upfront labs for both my husband and I relatively normal, but I was started on levothyroxine for high-normal TSH. AMH high normal as well. Post-ovulation progesterone levels normal. Ironically, a few months after we started trying, I had (what I believe to be) a bursting ovarian cyst (worst. Pain. Ever.). Had another 4 months later and then had a vaginal US which was normal. Also, my cycles became very long - 35-40 days. 4 months of fertility acupuncture, then circled back to western medicine and started on Clomid 50mg in April. Became pregnant the first round but ended in a chemical at 5.5 weeks. Month off, then round two in June- negative pregnancy test today :(. My OB wants to switch to letrozole. I have no formal diagnosis but “PCOS is possible”. My cycles have regulated (31-33 days). HSG was originally put off with Covid. Medicated cycles are not monitored.

Just wondering if there is anything more in terms of diagnostics I should be pushing for right now?? Any advice appreciated!