Am I being too sensitive?

Today I had my anatomy scan and my husband was with me. We found out that we are having a girl. Once we left out of the ultrasound he stated that he wasn't too thrilled we are having a girl. I immediately felt some type of way and went to the bathroom and cried. Heck I'm still crying about it. I haven't said anything to him about what he said. This is my first child. He has a boy and girl from his previous marriage. My stepson is not as boyish as my husband would like so I think he was really hoping for a boy so that he can have a son to do boy stuff with. On the way home he talked about how he has to make sure my stepson gets involved with sports. All I can think is wow and now wonder how he is going to feel about our daughter done the line. Am I over reacting?