quick way to make sure is to play musical chairs with the tires/wheels. See if it continues. Note that some vehicles have front/rear specific offsets, but you can swap the left for the right no problem.
Also, how bad is the noise? Every time I've had to deal with a wheel bearing it gave a constant noise, and it got louder as speed increased then just sort of stopped at around 50mph.
I suggest taking it to a mechanic if you don't know anything about cars. Its a pretty simple job, but there are lots of things to screw up with one missed detail.
You don't want a wheel falling off while you're driving. Its a pretty hairy situation.