Progesterone test

My doctor just left a message and said my CD 21 progesterone level was a 7.7 and said it was a good level for ovulation. I never get to speak with the doctor directly. They just leave messages in a special “mailbox” I feel like 7.7 is too low. I thought it needed to be over 10? Can someone help explain? I’m definitely looking into getting a new doctor. Year and half ttc and my doctor isn’t helping at all