Stressing

I am currently 8 weeks pregnant. My fiance and I tried for about 2 years then gave up on trying, because our wedding is August 2017. And low and behold I became pregnant. We are beyond excited and over joyed. Except yesterday he was placed on a PO hold for some thing that was not his fault. Our first appointment is Monday February 1st and he is looking at sitting 29 days. How do I go about not stressing out about this to maintain a healthy pregnancy. Also we have a high chance of twins and I definitely don't want anything to happen with me or the baby(ies)! Any stress relieving advice will help! Thank you!!!