US tomorrow. Major anxiety.

Jenna • 20, single, FTM. Baby boy due 10/24💙
Had an ultrasound two weeks ago, wasn't supposed to but they wanted to check for heartbeat since they couldn't find one on the Doppler. They didn't do measurements or anything they simply checked for the heartbeat and sent me on my way. Was at 171 BPM. Although I'm still extremely anxious. I'll be 11 weeks 6 days tomorrow and after seeing all these terrible posts about miscarrying and how the baby's heart stoppedI'm  just so scared. Am I being crazy or is this natural? I'm 20, in good health and have had nothing but a good progressive pregnancy so far and I'm still so anxious and filled with anxiety over my little sweetheart. I can't sleep. I don't think this will ever go away until I'm holding my baby in my arms. Can you relate!