HCG levels too low ?

Had pregnancy confirmed last week with HCG level of 535 (5 weeks) nurse said it made sense since I ovulated late June on the 21st . Nurse had me get more blood drawn 5 days later and HCG level is 3,305 (5 weeks 5days) she said he was expecting higher . I thought that was pretty high for saying 5 days had passed . Not sure if she remembered that I know that I ovulated late and not as far as I would be based of my last period June 3. Idk I'm just nervous like what is a high number .? Having a sono done tomorrow prayers that it's a healthy baby with a heartbeat will be 6 weeks