Quoting It's a boy!!!!*3/27/13*:" I have two girls and Dh and I were praying for a boy and found out today it is a boy! Doctor didn't get ... [snip!] ... Is it crazy that I am scared to believe it? Is it more common for boys to be mistaken as girls or girls mistaken as boys?"
lol I was scared to death of this too! We have 2 girls already and I found out at 15 weeks that we were finally getting a little boy! I had my anatomy ultrasound a couple days ago (21 weeks) and confirmed it IS a boy!
I think with today's technology it is hard to be wrong but then again, anything is possible lol