Im making up a hypothetical here, so bare with me. Suppose I am the button with AA, there are 2 callers before me. We will assume it is the .5/1 NL table. I raise 5, and both limpers call

Flop is Jh 9C 2H pot is 19.5

I bet 12 bucks, 1st caller folds, the 2nd reraises 30

This is a situation I feel I am confronted alot online. Do I automatically assume a set and let it go? How do I go about analyzing this hand.

Thanks