After that long it should be OK. Remember though that bubbles don't really mean anything at this point (some would argue never). The only way to insure your brew is finished fermenting is by doing some gravity tests with a hydrometer.
If your FG is stable (ie hasn't changed over the last 2 days) you won't have to worry about further fermentation in he bottle. I've never used tabs to carbonate .... Why not naturally ferment? Time?