Progesterone expired - HELP!!!

Okay, so my last pregnancy I was prescribed progesterone suppositories to help the pregnancy "stick" (I had 2 previous miscarriages). They didn't check my progesterone levels - just put me on progesterone right away. Delivered my son last November 9th. Well, I am pregnant again and I can't get in to the OB'S office as quickly as I would like. I have my progesterone suppositories from my last pregnancy but they are expired by 6 months. Is it dangerous to take them until I can get in to my OB? Will they just be not as strong in efficacy? I am coming up on 5 weeks and freaking out because I'm not having any discernible symptoms. Advice???