How do I stop worrying about this pregnancy?

Laurel
I had a miscarriage in January. We were crushed, I was about 8 weeks along. I found out a few days ago that I'm about 5 weeks pregnant. Which obviously I'm excited about. But I can't stop thinking what if something happens. So I guess my question is has anyone else had a miscarriage then gotten pregnant again and felt like this? Also does anyone have a success story after a miscarriage that could help ease my mind?