Remember, the only "activity" that means ANYTHING is a change in gravity, anything else can be deceiving, especially bubbles. Also remember that as the sticky in the beginners forum, and the million posts on here reiterate, it can take up to 3 days for yeast to get going- Fermentation can take 24 to 72 hrs to show visible signs.
And by visible signs, we STILL don't mean airlock activity.
Just because YOU'VE never experienced lag time before, doesn't mean there's anything wrong.
It's too soon to even begin to worry...after 72 hours take a grav reading and come back and say "You were right guys, thanks!!"