Progesterone Test!!! HELP!! Please read

Ok y’all I have a short luteal phase and high cortisol level (stress hormones) which also pushes progesterone down. I used opks and temp to confirm ovulation and my temps drop around 8-10 dpo and usually start my period by 11-12 dpo. I have used natural progesterone cream and even tested with Proov progesterone pee test that test at a level 5 and I’m never over it and the cream doesn’t help at all.

My ob doc prescribed 2.5mg of letrozole.

Now I wanna get a Progesterone blood test and she doesn’t seem concerned at all about my progesterone. She also told me if could thin out my uterus lining. (Now I don’t Believe that cus everywhere I read says you need progesterone to thicken it so the egg can implant) Duh idk wtf she is thinking.

I’m still worried and have had a cp back in May. I’m going for other blood work on cd3 next month so I’ll know more. Now my general will allow me to go get a Progesterone blood test but the ob would have to read it if it’s low.

Tomorrow is 7dpo would you say I should go get blood work?