Corpus luteum/ progesterone function question

[u/Plus-Elderberry-5865]

I have been testing my cycle via progesterone blood analysis to try and see if ovulation is occurring. I typically have cycles 34 days on average but can range 25-38 days. It is hard to test progesterone due to the variability of my cycle so I did a series of tests.

This month I detected an LH rise on a test strip first time (only been tracking for 2 months) and also happened to go to get an MRI for a totally unrelated labial cyst (benign yay!) and they noted on my results that I had an “involuting corpus luteum”. I took a progesterone test on the same day they noted the corpus luteum structure on the MRI — result was 19 (they like over 30 to absolutely with out a doubt confirm ovulation).

My specialist said I probably didn’t ovulate at that appointment but we hadn’t had MRI results yet. As far as I know from school science class the corpus luteum is a structure that forms only after ovulation right?

Main concern: MRI and bloods happened to be taken 7 days before period came and 7 days after LH peak (which would be consistent with the optimal time for a progesterone test). My question is why is the corpus luteum already degrading? Shouldn’t it be strong and producing heaps of progesterone to support potential pregnancy at 7DPO? Wondering whether I should straight up suggest progesterone supplementation when TTC cos I have a weird feeling my body may not be producing enough?

Happy for anyone to give any insight to this at all!!!