Airlock activity. Krausen. All of it is like trying to figure out if your car's gas tank is empty by taking the cap off and peering down the hole with a flashlight. You might get a general idea, but it's far from reliable or precise.
I see that you're new here, so I'll hit you with a piece of advice that I got when I first showed up here asking questions about gravity, etc.: get into the habit of using a hydrometer, friend. Otherwise, the amount of help these forum members can be will be severely limited. Take a gravity reading once the wort is cooled, to start...in the future.
In this particular case---here's what I'd recommend: wait another 3 or 4 days just to be sure. Then take a hydrometer reading and record your results. Wait another 3 days, then take another reading. If the two readings are the same, then it's done. If it's changed, then it's still got a little something going on in there...so let it be for another 4 days or so. After 2 weeks, with most ale yeasts, you can be relatively sure that it's okay to rack to secondary.
Good luck, and welcome!