QQ, strange action

[Claunchy]

Party Poker 0.50/1.00 Hold'em <font color="#0000FF">(10 handed)</font> link

Preflop: Hero is MP2 with Q[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 folds</font>, UTG+1 calls, UTG+2 calls, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, SB calls, BB calls, <font color="#CC3333">UTG+1 3-bets</font>, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero caps</font>, SB calls, BB calls, UTG+1 calls.

Flop: (17.00 SB) 3[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, <font color="#CC3333">UTG+1 raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls, UTG+1 calls.

Turn: (13.00 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, UTG+1 calls, Hero calls.

River: (16.00 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">UTG+1 bets</font>, Hero calls, SB folds.

Final Pot: 18.00 BB.

The turn donk bet by SB really threw me off here. I wasn't about to let this one go, but should I have gotten in another raise or two?

BTW, UTG+1 is clearly a nut, but SB hadn't done anything too strange yet.