This may be a touchy topic...

I experienced a miscarriage at 6 weeks in February and now I'm 4 weeks 5 days into expecting a second child. When the doctors examined my first, they didn't find any abnormalities and suggested that it just may have been my body reacting to a "foreign object". Is it likely for this to happen with my second? It's so hard to stay excited about this pregnancy when I can only think about the worst :(