OB check today and ultrasound tomorrow!!!

I went in for my regular OB check.  Everything looks great!  My uterus is measuring 21cm, which she said is large for 18 weeks, but she told me not to worry about it.  I don't have GD or anything, hopefully it just means there is lots of room for the baby.  The HB was 168, she predicts a girl.  I have my a/s tomorrow, and I guess we will find out!  I really hope boy for hubby, he is dying to have at least one boy......