Anyone else mega nervous about miscarrying?

Re

This is my first pregnancy, I’m 4 weeks and 1 day. I’m “obese” and a former smoker. I just feel like this is all too good to be true and I’m afraid to get my hopes up. I have my first doctors appointment at 6 weeks and 5 days, but It won’t be an ultrasound just yet. I’m so nervous that things won’t go as planned. Is this normal? Any tips for easing this anxiety?