That's standard. Mine was 22,000 at 6 weeks at that was so high they suspected twins, I had a ultrasound but only 1 heartbeat! Just a very high hcg
The best way to too is to take them a couple days apart and see if they rise. I've honestly seen and heard numbers all over the board. Did you ask your Dr what s/he thought about the numbers?
I think it's very normal. I think it is in the standard range.