Increased Humming sound.

UPDATE: I went to my "tire" guys and had them take a closer look. After a ride and inspection, they diagnosed that it the cause isn't the bearings but the result from possibly having to adjust/tighten front brakes. They added that the vibration is from the rotors rubbing and should adjust as I keep driving. I'll continue to drive it and see if its the case. Until then...thanx folks!