Had an unscheduled appointment today and..

 Well, during the ultrasound the nurse asked us if we wanted to know what we are having and I said yes and she said she thought it was a boy.. But the doctor said don't count on that its too early (I'm only 12w 5d).. I don't know if he is trying to cover his butt or if he honestly doesn't know! I really wanted a girl and have had a feeling it was a girl through the whole pregnancy! I would love a boy as well, but I've just made myself think it's a girl.. What are your thoughts? Too early? Or is it a boy?