Progesterone levels day 21

Hi all just wondering if anyone is able to help explain progesterone levels as my gp just says it’s normal, no explanation. They made me do a blood test on day 21 of my cycle and it came back as 7, though I did mention to them that I don’t ovulate on day 14 and was sure I had actually ovulated on day 22. With much headache I got them to retest me again on my actual day 23 and the results came back as 31. They’ve said both of these are normal but not explained normal for what? That I’ve ovulated? Reading online has just left me with questions and probably false hope of being on the road to a bfp this month.....any advice/experience?