OK, I went for a ride on Wensday and I think I lightly bumped my rear derailleur against a rock or something. The problem is, I can't get into the easiest gear on the rear cog, the shifter will shift all they way so the trigger reads 1, but it's still in "2". Then when I shift to "2" on the trigger, it goes to 3 on the rear briefly and then switches itself to 4. I think there may be something wrong with the cable but do you guys have any other suggestions?