Progesterone Levels

Tora • 43 and pregnant with my first baby.
Tested on Saturday, disappointed today when my doctor said my levels should be between 5 and 32, mine was 6. He's concerned and would like to see mine at 20. She's prescribing progesterone pills. This is all new to me, I'm asking God top allow me to carry and deliver a healthy baby. By the way, I'm 6w3d.