How long had it been since you checked the pressure in the tire?Tires natural loose pressure over time,even more when not being used.Some will loose air more than others.
If it's holding air there is probably nothing to worry about but just to be safe I would swap it out with the spare and take it to a tire shop and have it checked for leaks in a tank.
Also if you don't do it,one good practice is to check tire pressure prior to every trip and before heading home.
2015 Jay Flight 26BH Elite
2015 Chevy Silverado 2500,LT,4x4,6.0L
Honda EU2000I and Honda EU2000I Companion Generators.