I know I'm late to this thread, but I'd like to share my experience with ovarian PRP in case it helps anyone with a similar background. I had it for secondary or even tertiary infertility, so take what you will from my experience. My AMH levels were always in the "normal" range, even though I was 40 when I had it almost 6 years ago. I had 5 previous pregnancies, 2 with late terminations (24+3 weeks for both) due to fetal abnormalities, and the rest missed miscarriages. One of those miscarriages was an IVF pregnancy, the others natural/spontaneous ones. Once I had the second late termination at age 36 I became unable to get pregnant, and started my IVF journey. Had one IVF under NHS, got many eggs but two day 5 embryos with poor quality. Transfer didn't work, we only transferred hoping for a miracle, we knew chances were non-existent. We then went on to have 4 more cycles privately, the first one "worked" but ended in missed miscarriage, and then we wanted to do the three cycle banking for genetic testing, and we had around 20 day 5 embryos, only one of which tested normal. Transferred, didn't get pregnant.
Then I had the ovarian PRP in the Institute of Life clinic in Athens (Dr Garavelas), 4 years after my infertility journey began, when I was 40 (I was turning 41 in 5 months). I was told to wait for 6 months for the treatment to work before I consider doing IVF. I only had one treatment. It cost 1800 EUR then.
I waited for 4 months before we started trying to conceive naturally, and got pregnant in April. This pregnancy ended in missed miscarriage, and I had an ERPC to remove the pregnancy at the end of May. Right after the ERPC, I never got my period back, and started trying to conceive naturally after a month from the ERPC in August (8 months after the ovarian PRP), I got positive pregnancy test with my daughter who is now 4 and a half years old and is a healthy and happy, very precocious little girl. I was almost 42 (two months before I turned 42) when I had her.
Good luck to all the ladies still trying to conceive, it took us 7 years, lots of heartache and funds to get our multiple rainbow, but we tried multiple things before we found what worked for us. I know another couple - friends of ours who struggled with multiple IVF cycles for years (maybe over 10 years) who had a successful IVF pregnancy after an ovarian PRP.