Worrying myself to no end :(

What can I do to stop worrying about a possible miscarriage? It's like it's the only thing I think about sometimes. I guess it's normal to an extent but I know the worrying isn't healthy. every little cramp I get it scares me I'm constantly checking the toilet paper when I use the restroom for possible blood. It doesn't help that my doctor won't see me until I'm 11 weeks (it was the only opening she had) I'm only 4 weeks and 4 days so I've got a wait ahead of me. :(