pocket KK. when "probable" set?

[Diracdelta]

Party Poker 0.50/1 Hold'em (8 handed)

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img]. MP2 posts a blind of $0.50.
UTG calls, UTG+1 folds, MP1 folds, MP2 (poster) checks, <font color="CC3333">Hero raises</font>, Button calls, SB folds, BB folds, UTG calls, MP2 calls.

Flop: (9.50 SB) 5[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
<font color="CC3333">UTG bets</font>, MP2 folds, <font color="CC3333">Hero raises</font>, Button calls, UTG calls.

Turn: (7.75 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">UTG bets</font>, Hero calls, Button folds.

River: (9.75 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">UTG bets</font>, Hero calls.

Final Pot: 11.75 BB


My question is was it right to call it down, or should i have folded the turn. He probably had the queen when he continued betting after my flop raise.