My first baby. His second.

My boyfriend was married before we starting dating and has a 5 year old son. We have been together 2 years and just found out we are pregnant this month 😊 I am so incredibly excited for this whole journey. He has been nothing but supportive. And wants this baby just as much as I do. I guess I catch myself feeling a little upset because this is my first pregnancy, but it's not his..he's already been through all of this...anyone else in the same situation?