88

So I am one before the big blind, UTG raises everyone folds to me. I cold call the 2 bet raise with an 88 hoping to set trips. This leave me and UTG heads up. Flop comes down with an 8... we keep betting and he turns over JJ which fits neatly into the straight..

The question IS - should I have even called? Any guidlines for calling with mid to small pairs?

Peter