Everyone else has already said what I would have done. I didn't stop worrying throughout the pregnancy, and still think dd will die in the night.
But a few things did help. It's definitely worth getting an early scan - doesn't have to be private. Your GP might be able to arrange it (mine referred me) or some hospitals have a walk-in service open to women who have miscarried (e.g. St Thomas' in London).
Also, I was told that getting pregnant is the hardest part. You've proved you can do that, and so the chances are you will have children. And having one miscarriage, means that your chances of a second one aren't increased in the slightest. It's only if you have two or more that the risk increases. I had 3 but now have a lovely daughter.
Also, try and find something to do for the middle bit of your pregnancy. My partner and I got married when I was 22 weeks pregnant, we planned it on the basis that even if I did miscarry again, we'd have something to look forward to that year. And it gave me something to focus on that wasn't the pregnancy, which did make things easier. But you don't have to be as extreme as us, just book a nice holiday or something....
Oh, and, congratulations. It's still wonderful, as well as stressful
ps. Also go and find the preg after miscarriage thread - everyone on there has been through it, and will support you throughout the whole 40 weeks. They kept me sane.