Advice needed! How to stay calm after a miscarriage?

So I’m putting this out there because the few people I’ve talked to have offered no advice at all.

I had a miscarriage back in January. At the beginning of February they discovered it was an incomplete miscarriage so I got a shot of Methotrexate and was told to wait 2 periods to try again. Well here I am, just started my second period. My husband both agreed we want to try again but I can’t help but feel this sinking feeling at the idea of being pregnant again. I want a baby so bad, but I don’t know how to make it through the first 13 weeks without being constantly nervous. I know stress is bad for the baby, so I want to get it under control. Does anyone have any advice? Please! 🤗