So afraid of miscarriage

I’m 6w3d. I had a chemical in August (my first pregnancy). I cannot stop worrying that I’ll have a miscarriage. I’m afraid to be excited! I’m missing out on my pregnancy because I don’t believe that I’m going to meet my baby. It feels like everyone on here has multiple miscarriages and I will too.

I saw my baby on an ultrasound at 6 weeks exactly and he/she had a heartbeat. Now I’m worried that at my 8 week appointment there won’t be a heartbeat anymore.

Help 😢 I know stress isn’t good for the baby. I just need some reassurance.