To clarify, breaking the inside pouch and having the pack swell, only verfies that the yeast inside is still viable. It does not increase yeast cell count to any noticable extent. To get to a proper cell count, you must make a starter. Most likely, unless your OG was very low, you underpitched. Don't worry, it is what it is, you'll still make beer. Do some reading here http://www.mrmalty.com/ your beer will thank you.