lol, it's not your fault, it's just that so many people say it's a boy (inclusive the guy that i bought it from), but even more say that the bump is so small (or inexistent) and it's a girl ... i think i'll wait for him/her to get bigger and see.
I had the exact same issue with my girl! You should find that thread, it was in March in the General Disc.and was something like "Do you still think I have a boy?"
Mine a little bump and I thought I have a boy, and many members said I have a boy, but those who said "girl" were right...
And by that age, if she was a male, would have colours and bigger casque.