What exactly does testing progesterone do/ tell you?

I had my progesterone tested the other day. My Dr has not called me about it like she usually does after lab work, but the results were posted online along with a reference guid. It shows I'm within the range of where I should be (luteal phase), but what does that mean?

We have been TTC for over 3 years (1 early miscarriage 2 years ago) and this cycle was my third round of letrozole.

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