I'm guessing it was the pothole I hit on my commute home. After that I noticed a very slight wobble in the rear wheel that would become more pronounced the faster I went.
Does it sound like my wheel needs to be trued? I replaced my rear wheel back in November. I checked the spokes and they are all fine.
And should I stay completely off of it? Ride it to the shop? Would it handle another day or two of commuting? (12 miles roundtrip) My bike is a Gary Fisher mountain bike.