Wait a minute

I'm kind of freaking out right now. We picked up a toddler bed from our neighbor tonight and Brian got it all set up in Wesley's room (with his crib still there). I methodically reminded Brian how we did with this with Noah.......first we let him look at it and get used to its presence....then we let him take naps in it but still sleep in his crib at night....etc, etc.
I gave Noah a late bath tonight and walk about of the bathroom to find Wesley's door already closed and Brian told me he put him to bed. I said, "Did he ask about the big boy bed at all??"
"He's in the big boy bed" Brian says.
Ummmmmmmm, what?????? "I'm not ready" is all I could keep saying. I didn't even get to look at him! There's no turning back. One night in the big boy bed and he'll never want to sleep in the crib again! And I'm kinda progression-oriented so I can't rationalize putting him in the crib some nights and not others. What just happened???? My baby..........