New puppy

We are getting this cutie on Monday. She will be our third, our first passed away at 11 about a year and a half ago. Our boy just turned 2. We made the mistake of getting our boy when our girl was a senior and she absolutely hated him. So I wanted to get another while my boy is still young.

The breeder tells me that our new girl is extremely bonded with her sibling and she suspects she may have a rough couple days upon bringing her home. Im sad about the baby missing her mom and sister and im stressed thinking about my boy and whether im ruining his life.

Are these feelings normal, does anyone else feel/has felt like this?