C-section tomorrow

My csection is scheduled for tomorrow and I literally can’t sleep at all anymore. Taking my daughter for a mommy daughter day today of shopping and lunch (before nap time.) I have so many emotions that I didn’t have the first time around. I’m so excited to give my little girl a brother and best friend, but also feel so guilty. She didn’t ask for a baby and this is going to completely turn her world upside down. She’s 3 so she understands a little what’s going on, but not completely. How can I possibly love another baby as much as I love her?