I am only 10 weeks and i am counting down the weeks till i can go for the u/s to find out the sex. DF and i always find out as we like to be prepared, I know we are shocking. I always ask at the 12-13 week scan too, just incase they can see (i told you i was shocking). I HATE surprises.
I just try not to think of it, but as you probably know its always on the back of your mind!
Goodluck.