It sounds like it. They tend to develop kind of fast though, so you should feel a knot in that area and see some redness soon. If not, it might just be a regular old bruise, perhaps you hit something while you were sleeping or rested your chin on you hand for too long.

Oh no, I also have an ulcer inside my bottom lip, could this be linked?

Is it in the same area as the other pain you were describing? If so, that's probably the cause.

It's about 1 and a half inches away from it

Hmm - in that case it is probably just a coincidence. I don't see why a canker sore would be related to either a bruise or a pimple.