I recently had a root canal (about 8 days ago) and everything has been fine for the first five days. But, I've begun to feel a small amount of pain in an adjacent tooth, no sensitivity to heat, cold, or tapping. But whenever I apply pressure in the direction of the root canaled tooth, I feel a slight pain in the tooth.

I don't think it's infected as I don't have or never had a cavity on this tooth. I'm sort of freaking out and I'm curious if the roots could be a bit agitated from the root canal or something. Is it nothing or should I ask my dentist about it?