Progesterone cd 21 results

Randi
So, I had the infamous progesterone test along with a few others. I have one child who will be 3 and one MC in May last year. And as of now no luck getting pregnant. I didn't really try with my daughter it just happened when we decided let's start trying. Anyway, my test said 2.8... no on the lab it says normal range but it's like almost lowest it can be for normal. Everything I've looked at says that's low. I've had irregular periods since October. So I finally bugged my OB for this test because it was my feeling it was low. Anyway the nurse on the phone said all my tests were normal. Nothing back from the doctor yet. Appointment in March. Any thoughts on that 2.7 result for progesterone?