HCG still looking good 12-20-10

I went in for my second blood test today. My HCG level came back at 2247. They had just wanted to make sure it doubled since the last test (which it obviously did), and said there was nothing negative about the fact that it was that much higher. The nurse who called me thinks it's an indicator of 2, but doesn't want to get my hopes up in case it isn't. Another interesting thing about this number...last time on day 16 (same day as this test), my HCG was only 255.