My First Imperial, and of course, a question...

I just started my first Imperial recipe (Denny Cohn's Bourbon Vanilla Imperial Porter) the other day, and it is my first all-grain, and now I am nervous. I brewed on Saturday, but the primary fermenter has only bubbled a little bit. I haven't seen it bubble, but my wife swears that she has. There are little air bubbles in the air lock, and there is obviously pressure in the vessel. Did I make a mistake in my methods? Should I start over? Am I wasting time making a watery brew? Help!