Only child about to be big brother?

I’m so excited to be pregnant with our second child, but I also get mixed feelings when I think about my only son right now.

I feel guilty that I’m going to throw his routines off and change his life by adding a brother or sister. I’m the oldest and loved having siblings, but I can’t help just feeling a little bad.

Any other moms feel this second baby guilt? Advice or words of encouragement?

Side note: he is 15 mo and will be 22mo when new baby comes in November.