Progesterone levels dropped

Brianna

So I had my first blood test on (03/03) my

HCG was at 166.76

progesterone was at 20.87

I retested on 03/17

HCG is at 17019.00

Progesterone is at 14.59

Dr still says levels are normal and good but to me that was a big drop in my progesterone. Should I be concerned or is this normal??