I don't know what to do....

Not sure about the brother stopping at the shower...but i do have to say...it will be your day and nothing will overshawdow it!!! You should be excited for your brother! i went through the same thing with my bro...he got engaged 4 months after me...then decided to have his wedding day...last month!!!!! I was pissed off after a bit, then realized it's an exciting time for everyone!!! The wedding day was great!!! And mine will be as well!! Sh*t happens...don't let it stress you out!!

P.S. Guess who decides to announce that they are having a baby right before my wedding day...you got it...my brother and his wife!! My wedding will be the first time a lot of family will see them since the announcement. I am fine with it!!