HCG Levels 5 weeks 4 days

Hey guys, first pregnancy and I might be looking into this too much but I got my 2nd hcg levels tested yesterday at 5 weeks and 4 days and they're sitting at 17,900. Good that they have risen from 6,750 3 days prior. But I'm worried because 17,900 seems high for the end of 5 weeks. Anybody had experience with high hcg levels this early and then had healthy normal pregnancies?