Thinking positive

Crystal • High school sweethearts who never fell out of love.
I had a chemical pregnancy somewhere in between 5-6 weeks of the pregnancy with it being confirmed at what would have been 8 weeks. Now all I think about is how not to let it happen again. How if we de become pregnant, what can't I do. And if I do get pregnant, will I miscarry again? I've a very positive person and this isn't me. I always see the light in things but this was a first and idk how to be positive about it after. What helped you? 
I love to eat junk but I don't want to do that forever.