Progesterone

Any of you ladies have experience with the progesterone shots? I've had two miscarriages one at 13 weeks and one at 21 weeks. I decided to get some answers because I don't want to experience a loss again. I was told I would have to get a cerclage in my next pregnancy. I have been doing research on the cerclage however and I would rather try progesterone shots first. Any success stories?