Progesterone supplements - What to expect?

Max'smom

My OB office just called and had my progesterone results. The nurse said my levels were fine and asked if Dr. had put me on supplements at my appt. He had not so she went to double check with him. And he does want me to start supplements because I am on the low side of normal.

I have never had my progesterone levels check in my 3 previous pregnancies, but had a miscarriage earlier this year. I think that is why he test me this time.

Can anyone share what I could expect?