KK under pressure

[crockpot]

party 2/4. table is fairly loose but neither of the key opponents in this hand has gotten out of line in four orbits.

dealt KK in the cutoff. three limpers, i raise, button folds, blinds and limpers call. six to the flop for two bets each.

flop: 973 rainbow.

checked to UTG who bets, two fold, i call planning to raise on the turn. to my surprise SB check-raises. BB folds, UTG 3-bets. what's my play?