As Revvy is so fond of pointing out, whether there are bubbles coming out of your airlock or not isn't really very useful information at this point. If it's been fermenting a while and the krausen fell, in all likelihood it is done, but you just don't have all the information you need.
Take a hydrometer reading. Then wait two days and take another. If it is the same, off you go. If it is lower, then wait a few more days. When you're stable for 2-3 days, you know fermentation is compete; that is the only actual fact that tells you it is done. Use that approach with every single beer you ever brew, and you won't be guessing any more.