Progesterone treatment?

Has anyone ever been on progesterone to stay pregnant? I’ve had 3 miscarriages and finally found a doctor that ran test for me and they did a cycle day 20 test and my levels were like a 9 when they should have been 20+ according to the doctor. Anyway she wants me to start taking progesterone suppositories after I ovulate until my period comes or I get a negative pregnancy test. Anyone else ever do this? Did you stay pregnant? I can get pregnant I just can’t stay pregnant because my body tells my uterine lining to shed so I’m hoping this and a lot of prayers work 💕