Mixed emotions..is this normal?

Aubrey • 26, married 06/2013, 1st babe born 9/17/2017 💜, 2nd babe born 4/20/2020 💜
I'm truly excited that we're having a baby but for some reason I have times where I'm not excited...I just keep thinking about how nothing will be the same and hoping that it doesn't effect the relationship between my mom and I. Maybe it's because it's so early (5 weeks) and nobody really knows but I keep going back and forth and I just want to be excited :(