Progesterone while TTC

Sarah
This is our 5th month ttc. Every month I start spotting around cycle day 20 through cycle day 29 when I start my period. I went to see my dr and he prescribed me an oral progesterone. Wondering if anyone had success getting pregnant with progesterone. I'm going in on Friday to take the 21 day progesterone test, and then I'll start taking it.