taking progesterone for recurrent pregnancy loss

I had 3 miscarriages in 2016, still TTC #1. I've been seeing an RE and all my tests are normal. My RE prescribed Progesterone as some women with RPL have had success even though my progesterone levels are normal. I'm giving it a try and starting the medication tomorrow 3 days after +opk. Has anyone taken progesterone for RPL and had a successful pregnancy? What was your experience taking progesterone?