High HCG

Em
Our first ultrasound is tomorrow (Tuesday) at 8 weeks. My bloodtest hcg level was 19445 at about 5ish weeks so doc is ruling multiples out. Has anyone else had this high of levels that early? Nervous that we won't see a heartbeat or something could go wrong still. Doc said my levels are really really really good though. I guess I'm so nervous due to our first pregnancy being a chemical Pregnancy and having seen the baby on ultrasound that just didn't attach or attach right. I had a 12 week miscarriage before as well in 2007 and babies heart stopped.