Brewed a standard brown ale 18 days ago. It's still in the primary right now since I checked the SG after 14 days it was only down to 1.026, and it's supposed to end up at 1.016. The krausen dropped after about 12 days and the airlock has been burping once every 2-3 minutes. I'm planning on leaving it in the primary, rousing daily, keeping the temps at 69-70ish, and checking the gravity in a few more days to see if it's moved.
If there are no visible signs of fermentation, can I be confident it's doing anything at all? Does beer ever continue to ferment even when there is no krausen, bubbles, or airlock activity?