The outgoing pressure should protect it and keep it from going bad.
If your girlfriend is not impressed, I still have a stained ceiling that she could come and clean!
Blowoffs can be rather spectacular, loud, messy, and my last one was a porter so it made a very visible mess with the dark stains. That is why I never store carboys in closets with cloths.
But don't worry, your brew will be fine, just give it time and next time / ALWAYS use a blowoff tube to start with, then throw on the airlock later, or don't bother.
In Primary: Belgium Chimay clones.
In Secondary: Braggot, pale ale, end of the world white.
Conditioning: Mead, Cider, braggot, Belgium Wheat.
On Tap: Clones, Chimay Blue, Red, Porter, malted cider.
Bottles: Far, far, too many to list.