Cd 21 progesterone level

So I got my results from my progesterone bloodwork and the nurse said it was .31. My doctor hasn't called me yet, since she is on vacation, to explain what that means. I'm guessing that's super low and that may be why I haven't gotten a position opk, since I've been testing daily. I'm currently on 1st round of clomid 50mg. Had a miscarriage in May and af has been elusive since. What level should I be at??