Low progesterone


I had been having on and off light bleeding for over a week. My doctor did a blood test and it came back my progesterone was kinda low she said. It was an 8.5 and she wanted it at 15. Since I started taking them I haven't had any more bleeding but I've read that taking them doesn't actually help. I was wondering if anyone else had or has low progesterone and if they are or have taken supplements???