Am I a bad person for not wanting my mother in the delivery room?

Tonight my mom brought up wanting to be in the delivery room when I have my son. I've told her a couple times that I was thinking about just having my husband in there with me. When I told her that tonight she seemed to get pretty upset about it, and didn't even say bye to me when she left. I understand why she wants to be in there, but my husband and I feel that it's going to be an intimate moment that we want to share in privacy. I'm hurt, annoyed, and kind of upset about the way she acted. It's not like I won't let her in there at all. Am I wrong for wanting it this way? Both of my sisters kind of made the situation worse by saying they would let her in the delivery room with them. Neither of them are even married or anything yet. Plus it's not just about me and my decision. It's my husband's baby too.