Short Cycles and Fertility Treatments

I’ve tried to search for this but didn’t see much about what is recommended for short cycles.

I’m 12 cycles into TTC.

Basically, I have a 21-24 day cycle. It usually alternates each month. I got one of those expensive hormone trackers because the OPK strip readings were all over the place. Turns out I have a LH spike around 8 days and then I have a second one on day 13-14. With a 21 day cycle, this means my luteal phase is 7-8 days, which is, from what I understand, is very short.

I’m about to see a fertility doctor at the end of the month. I haven’t had much luck finding out what they do for this on the wiki or elsewhere (most people with fertility struggles have PCOS/long cycles or unexplained fertility with average length cycles). Any information would be super helpful.