I'm not a doctor but I get to play one in medical school.
Your symptoms could be consistent with tendonitis and some inflammation of the ulnar nerve which goes around the elbow. Notice how when you hit your "funny bone" only you're ring and pinky finger get tingly. Well that's your ulnar nerve.
I'm no orthopedist or anything, but it could also just be some muscle strain in the muscles in your hand or finger. And are you sure you haven't accidentally bumped it some time or slept on it funny. Do you have any swelling in the joints? Are they red?
Two quick tests you can do for CTS is to 1) put your hands back to back in front of you, pointing down. It's hard to describe, but it would be like a reverse prayer position. So instead of palms, backs of your hands and wrists, and instead of fingers pointing up, point them down to the floor. So basically you're trying to flex your wrist. Do this for 30 seconds. If you feel tingling or numbness this is a positive Phelan's sign. 2) Tinel's sign - tap over the wrist crease. Again if you feel tingling or numbness radiating into your palm, that would be positive.
Those are two of the "classic" findings in CTS.
Anyway, I don't think it's CTS and you probably slept on it wrong or bumped it sometime without remembering. Lot's of people come in with bruises and stuff that they don't remember getting. But definitely go to your doctor, you really have to be able to see these things in person to make any real judgements. Oh, and I made no recommendations in this email so you can't sue me or anything, besides I'm a broke student, so I've got nothing.
Michael