I remember this feeling so well....and I wanted a boy first then a girl, but always knew I had to have a girl....I even told my DH that I wanted a boy first then a girl....2 boys was fine too, but then we would be adopting a girl! The only sway we did for DD1 was shettles timing and it worked.....but i do remember the week leading up to that US. I was so worried that I'd burst into tears and freak out if they said boy....
You get to post and vent here....I told no one, just smiled alot and said you get what you get!!! Whatever little bean you're growing in there is going to bless your life. Your son may get a brother~ we have a friend whose brother flew in and made it into the delivery room of his brothers first born! That's a patient sister in law! They were crying and blubbering all over each other....two big macho guys.....they are the ones that make me wonder if I'll have to try for a DS next spring even though I keep telling myself I'm done.....
Or your DS may get a sister and get to teach her about dinos and dump trucks and she'll teach him to have a tea party and paint toes! Either way a new baby and sibling is a great adventure....and it's okay to be a little disappointed/sad...and we're here for you to vent!