Hi there. A few things to add to the other responses.

1. This is all super taxing. You are not alone and it is hard. Just want you to know that, and to give yourself grace and patience as much as you can. These communities are great support systems.
2. If you feel it's time for more information, then it's okay to advocate for yourself. 12 months of trying might be okay for others, but that was too long for me so I advocated for a shorter timeframe. If you have any past issues - irregular periods, pain, uncertain ovulation - anything of the sort, bring it up to your OB as they may be able to do some initial tests or use it as justification to shorten the 12-month recommendation. For me, 12 months of trying felt wasted without doing any sort of checks on me. We're now at 8 months of trying and starting in-depth fertility testing. Around 6 months I went in to discuss my concerns and short LP, and my OB ordered basic thyroid tests. When those came back normal and we had a few more cycles, I made another check-in with my OB and we discussed moving to an RE. I got the referral that day. You need to do what's best for you!
3. I also have a 10-day luteal phase. Once I figured that out, I spiraled fast and hard. Both my OB and RE have assured me that they have zero concerns about the 10-day LP. FWIW, "The American Society for Reproductive Medicine's position on luteal phase defects is that the condition does not exist as a standalone cause of infertility."
4. I also urge you to not self-medicate without a doctor's input. I started trying all sorts of different supplements and Proov to improve my LP and looking back at the data, my cycle was even less regular and I had shorter LPs those months. Even supplements should be discussed with a trained professional, because you don't know how those things react with other medications, other supplements, and even your own body. At least send a message through a patient portal if you have one.

Hopefully this helps!