J.C.
You go by what comes out! Haha, just joking with you! I know waiting is hard, but it's the only 100% foolproof method for finding out!
Have to laugh at the Chinese gender prediction, though...just the other day, I looked for fun, and according to the Chinese gender prediction, all three of my boys were supposed to have been girls and my one girl should be a boy, lol! So then, I started looking up others whose info I knew....the Chinese gender predictor was 100% wrong on every single one! So, going from that, I'd say you definitely ARE having a boy ;-)