I think I'm going crazy

So I finally found out the gender (girl) I'm 27 weeks for some reason I FEEL SO IFFY ABOUT IT LIKE I'm not convince it's a girl But obviously there was no boy parts lol I just feel like once baby is here it's going to be a Boy!? HAS ANYONE WENT THRU A SURPRISE GENDER ? WERE THEY SAID BABY WAS ONE THING AND IT CAME OUT TO BE ANOTHER ?