HCG levels what do they mean

Ha

Hello this is first pregnancy and I just did my blood test a few days ago and they called back with my results and told me I am 6 weeks along and my HCG levels are 17,000.. she said the levels are high which is good.. but I haven’t seen a doctor or anything yet. What are these levels and should I be worried at all?

Our first dr appt and ultrasound is July 8th.