I did the same thing, only at 16 weeks. I was so sure this one was my lil girl! Still kinda (not much) holding out hope that it still is. When they said boy, I'm thinking nope you gotta be wrong. But mind looked pretty dead on too! If this one of mine truly is another boy it makes a total for 5 for me. I know how it feels. I want my daughter sooooooooooooooo badly!
Don't bottle up your emotions though! And know that if you ever need to talk, you have a place to come. With people who understand!