This is going to sound so selfish..

So I just found out I’m having a boy, this is my first pregnancy and everything is going great. But I grew up around all girls, my boyfriends family is over run by girls, I have a 7 month old niece I watch everyday. I just feel a liiiiitle bit disappointed idk not bc I don’t WANT a boy I just think I was expecting it to be girl and it just needs to set in. Idk I just feel like a terrible mom for being disappointed but I guess what I’m really asking is will this feeling go away??? I wanna be happy I’m having a baby boy. Please don’t judge I’m so grateful for my pregnancy I just don’t know how I’m feeling.