What are normal HCG levels?

Erica
I went to the e.r on July 18 this past Saturday. They took urine, blood, and did an ultrasound. Everything looked fine. They changed my due date I was measuring 4 weeks 5 days. I'm now 5 weeks and 3 days. My hcg levels were 1,519 is that good? And there was a gestational sac.