Here is my 12 weeks scan. It's not a very good picture at all, and I still can't see the nub myself. BUT...a few people on here have mad nub guessing skillz and made a guess based on what they could see - and they all said LOOKS BOYish!
I can't get the pic to load, so I'll just post the link to my nub post if you're curious! http://www.in-gender.com/cs/forums/t/203453.aspx
Following that is my 20 week shot from yesterday - confirmed - ALL BOY!!! :) I remain the Queen of the House, with 4 boys and a husband!