What number indicates ovulation on cycle day 21?

First time was 7 ng/ml.
Second time was 9 ng/ml.

Doctor doesn't seem concerned. He says I am young (28) and it indicated ovulation because it was above 5. Everything I am reading says above 10 is what you want.
I have only ever had one positive ovulation pee stick and that was the month I had a 7.0ng/ml.

Also to note: I have PCOS with irregular periods and have been trying for well over a year. I have been eating low carb/keto and my periods have been coming much more frequently.