Koalatom1 aw I totally get where you're coming from. This baby is a boy, my second and final pregnancy so I definitely won't have a girl. I'm actually super happy and excited to be having another boy, and for DS to have a little brother, as (and this is only my opinion, and of course it varies child to child) same sex siblings are often closer/easier, they play together more naturally etc. I have a sister so that's probably why that's my view!
So I'm not sad at all to be having another boy, the opposite, but it's the fact that I absolutely won't have a girl. I'm a fairly girlie girl, I like shopping, clothes, make up etc and although I like working out I hate all sports. I also have a great relationship with my mum so feel sad I won't have that mother/daughter relationship.
But honestly, things are changing now and gender stereotypes are (hopefully) becoming less and less. Boys doesn't equal smelly, shouty, sports loving children. Quite the opposite. DS is only 2.9 but I can't see him liking sports and instead he seems to be like me personality wise, a bit of a goodie two shoes, he's not rough and such a little scaredy cat. A daughter also doesn't equal a close mother/daughter relationship, in fact I know so many girls who aren't particularly close to their mums. It really does depend on the two personalities - mother and child. My mum and sister have a great relationship but my sister is so the opposite of me - she wears (IMO 
) horrible hippy clothes which she never washes, she has dreads, piercings etc. definitely not the "mini me" image that we tend to conjure if we want a girl.
I feel the same about the judgey comments though, I haven't made it public that it's another boy yet but I'm really going to over emphasise that I'm so happy to be having two of the same, as I know there will no doubt be the odd comment. I don't think parents of all girls get that as much - well actually it's the dads that get the comments eg don't you want a boy, and for a girl it's us who get the comments.
Let yourself feel a bit disappointed as you are entitled to, but then try and move on, don't dwell on it, as there's nothing you can do. Look at all the positives: no teenage girls (I always thought I was a lovely teenager but my mum assures me I was horrible!), less of the worry about emotional bullying in school. If you had a girl after two boys, there's a chance she would be left out.
And let's face it, as if you're going to be disappointed with your beautiful baby boy when he's here.