JJ in SB - 30/60

[johnnycakes]

I'm new to the table. No reads on villian.

Party Poker 30/60 Hold'em (8 handed) converter

Preflop: Hero is SB with J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, Button calls.

Flop: (7 SB) 5[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

Turn: (4.50 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero calls.

River: (8.50 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 10.50 BB

Did I go into call-down mode too soon?
Or should I have the balls to 3-bet an unknown opponent who waits til the turn to raise me?