Bubbles in the airlock aren't a reliable method of determining fermentation. Did you receive a hydrometer with your kit? If not I would go and purchase one. Only the hydrometer can accurately tell you how your fermentation is progressing.
At any rate, leave it until at least this saturday before you start worrying about it. Beer is actually pretty hard to screw up as long as your sanitation is good.
Edit: Welcome to HBT and congrats on the first batch!