2/4: Middle set facing turn action

[Newtown]

UTG is 40/1/.5
SB is 37/9/1

Flop looked safe so when SB 3-bet I just called planning on popping the turn.

PokerStars 2/4 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">SB 3-bets</font>, <font color="#666666">1 fold</font>, UTG calls, Hero calls.

Flop: (10 SB) 7[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, UTG calls, Hero calls.

Turn: (9.50 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">UTG raises</font>, Hero ... ?