Day 21 progesterone

Lizzie • Due in July 2019 with our rainbow after a loss on 6-28-18. Blessed with a 2.5 year old, 7 year old and 13 year old. All boys

I miscarried on June 28, I had my progesterone drawn this week at approximately 7dpo because I was almost certain that I ovulated last week, my progesterone came back at 9.6. My doctor said that is normal for “post ovulation” and although it’s super close to 10 I have read that anything over 10 is better for a natural cycle. Anybody have insights on this?