Progesterone injections

Jennifer
I am in my first cycle on Femara 5mg and Metformin 1500mg and found out I still didn't ovulate. Now my RE wants to begin progesterone injections to induce a period. Does anyone have any experience with this? I took Provera a few months ago when I didn't ovulate on Clomid, and it was awful! I'm really nervous about this.