Ovulation Progesterone Levels?

I got my progesterone level results today after my 25 day test after using Clomid for the first time - 50mg days CD5-9. My levels were at a 4.4 . My doctor said that is good & I did indeed ovulate.
I am wondering if 4.4 is on the lower end though? And if so - could raising my Clomid mg increase my chances of conceiving? 
Thanks ladies & GL on your TTC journey!