Resent your own child?

So I’m currently 30 weeks pregnant with a baby boy. This is my first child. However my SO already has a 7 year old boy. When we planned this pregnancy we both really wanted it to be a girl.

However, that was not the case. It didn’t take long for me to accept the fact that it’s a boy & I’m so ready to meet my baby boy 💙 however, I still feel that my SO is disappointed.

Just tonight we were talking about how happy we are about where our relationship is & the fact that we will be having a baby soon. I told him that I wouldn’t change a thing and his response was “well I would” & I said what & his reply was “I’d be getting my baby girl.” This really upset me bc I love our baby boy & I wouldn’t trade him for a girl if it were possible. I know my SO loves him as well but I also kinda worry that he will almost resent him bc it’s not a little girl & he already has his own boy. Any of you ladies dealt with something like this!? Am I overreacting for feeling somewhat hurt over his comment?