low progesterone and PCOS help!?

I have PCOS. I've been taking metformin, and last month I had a normal cycle. My progesterone increased from 3.3 to 6 after ovulation, but that still seems pretty low!!! My doctor told me not to worry but I feel she's wrong. My progesterone in my first pregnancy that ended in MC was low and my dr refused to do anything about it and said it was low normal even though it was just over 5 at 7 weeks pregnant!!! So I should currently be ovulating and I'm worried if my doctor doesn't address the progesterone I could lose another baby should I get pregnant. 😥 what should I do?