You should be fine.
Always use a hydrometer to answer your own question. Once the gravity is stable for three days...the beer is done.
Some residual CO2 production is normal.
How many days in the primary? If you have a total of 20+/- days in fermentation vessels, you're fine to bottle. Don't let a $3.00 airlock dictate your beers progress.
Now, if you brewed up a double IPA at 10.5%, that's a different story.