What yeast, starting gravity, and what is/was the temp in the basement?
I've had 1.050 beers ferment most of the way in 2-3 days at 67-70F before. Don't rely on the bubbles in the airlock so much. I have a 1.071 DIPA going right now and I'm getting very little bubble action in my blowoff bucket. I suspect my carboy cap is not 100% secure around the opening, but there's definitely CO2 in the chest freezer.
Take a reading when you get your new hydrometer and go from there.