The change in airlock activity probably means nothing. It is just a vent as so many people will tell you around here. Your beer probably is still fermenting away. Check it with a hydrometer though in a few days. It's the only real way to tell what's going on.
"An intelligent man is sometimes forced to be drunk to spend time with his fools."
Primary: CDJ IPA #1, Sea Cow Pale #1
Bottle: Scroatmeal Stout, Kolsch, Honey Blonde, Imperial Stout, Raspberry Stout, Blackberry Stout
Keg: Pumpkin Porter, Vanilla Porter
Future: Irish Red, Centennial Blonde, White Ale, Whiskey Imperial Stout #1, Saison #1