first time pregnancy anxiety?!

I'm 5 weeks & 4 days pregnant. No morning sickness, just super sore boobs & low energy. Since the day I found out, I've had this concern I'll miscarry or go in for my ultrasound & they won't find a heartbeat. I'm so, so excited to be pregnant & have our baby, but at the same time I'm almost scared to get too excited. Has anyone else experienced this? Sometimes looking at miscarriage rates, I feel so scared thinking that it could be me, but some days I feel like the odds are still in my favor to have a healthy pregnancy. Does anyone have any tips or advice? My ultrasound will be Dec 20th when I'm 9 weeks.