Am I being over cautious of my emotions?!

App says 6 weeks today according to conception date.. I’ve had no bleeding and some minor cramping a week ago, but I’m having a hard time believing everything is okay in there! I had a chemical 2 months ago and now I can’t even enjoy being pregnant because I’m so damn scared! My ultrasound is one week from today. What eased all your minds that you WOULD see a heartbeat? I’m terrified I won’t 😪