Got to the urgent care, they took a look at me, said it shows none of the symptoms of a blood clot, but since the pain didn't happen again while I was with the doctor (of course), there wasn't much they could do. They think it's a twisted tendon, coupled with some dehydration, and it'll work itself out....but also told me the symptoms to watch for that would say that it is a clot (heat, redness) in which case I should go to the emergency room.