Miscarriage + Trying again advise

I had a miscarriage in Feburary. It was our first time trying so I knew how blessed we were for it to happen so quickly and I was about 6 weeks along. The doctor said it has nothing to do with me exercising (I mostly just run) and that these things just happen sometimes. We are going to start trying again next month after my second period cycle as suggested by my doctor. I love running, it's like my therapy and I know it will help with the anxiety and fear of something bad happening again but then again I'm afraid that it will increase my chances of having another miscarriage. I know that doctors say that there's nothing I did that made this happen but the fear is still there. Any advise from others that may have gone through a similar experience?