Progesterone? GIVE ME HOPE!!!!

Lindsey • PCOS, TTC 🌈 baby.
We've been TTC for awhile, but had 2 miscarriages (October, March) while not actually "trying" (as in, we just started tracking everything to have a better chance this past 2-3 months). Ever since my miscarriage in March I've been bleeding every 2 weeks, finally got my doctor to listen to me that something was off and she started me on Progesterone CD 16-25. 
I'm only on CD 4, so in a couple of weeks it will be my first 10-day go at it. About 2 years ago, I had a REALLY bad experience with Provera. So I'm kind of terrified. Isn't it similar?
Does anyone have any success stories with Progesterone? I have PCOS so it's been a nightmare TTC. I seriously am almost ready to give up because the heart break of a BFN every month is unbearable. 
I need some hope here!