Power goes out all of the time at my home and I've yet to have a problem. That's effectively the same as unplugging it. I suppose something could happen, but I doubt it did unless there's something very unique about your amp. Loud thumps are pretty typical too. Chances are in fact that pulling the plug has exactly the same electrical effect as turning off the power switch . . . again, depending on your amp.
I would fire it up and see if it works.
I would fire it up and see if it works.