What does your hydrometer say? There are any number of reasons for the airlock to stop bubbling, few of which have to do with the fermentation. If you're at, or near, your predicted FG, your carboy or airlock likely has a leak somewhere or, depending on your yeast, it may have finished that quickly. Take readings for a couple days and see if they change. If not bottle. If you have a refractometer and don't mind it reading strangely - they don't measure the gravity the same way as a hydrometer - use it due to the smaller sample size (a couple drops) required. You're looking for change, not an absolute measurement. If the readings stay the same over a few days (3-4), it's done. From there you can choose, either let it condition in primary for a while longer (usually my choice), rack it to another carboy and let it condition there at room temperature, or bottle it and let it condition in the bottle. Here's a place where certainty is good - unfermented sugars have a way of fermenting in bottles, causing them to fail catastrophically (read explode).