Oh hell yea Travis! Dude, as you damned well know, that is the most incredible and important thing you will do in your life, hands down. Your son or daughter will challenge in you in ways you can't possibly anticipate now, but without you there, rising to the challenges, they will not have their true dad in their lives.
I'm not exaggerating when I say that my own "surprise" daughter, now 19, has saved my life and focussed me on what's important more times than I can count over the years.
A huge and sincere congratulations to you and your fiancee, Travis!