Leave it for another 7-14 days, or until you have stable gravity for 3 days in a row. I hardly ever see CO2 escaping from my fermentation...my buckets (and lids) don't seal very well and the gas disperses around the gasket and not the airlock. I usually leave mine for 10-14 days and then begin to check gravity readings with my hydrometer. Follow the instruction of the particular yeast strain you used. Ales ferment faster than lagers, for sure. So what did you brew?