K9s in BB

[Fiddler]

Hadn't been at the table long so no reads.

Party Poker 0.50/1 Hold'em (10 handed)

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG folds, UTG+1 calls, UTG+2 folds, MP1 folds, MP2 calls, MP3 folds, CO calls, Button calls, SB completes, Hero checks.

Flop: (6 SB) 4[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="blue">(6 players)</font>
<font color="CC3333">SB bets</font>, Hero calls, UTG+1 calls, <font color="CC3333">MP2 raises</font>, CO calls, <font color="CC3333">Button 3-bets</font>, SB calls, <font color="CC3333">Hero caps</font>, UTG+1 folds, MP2 calls, CO folds, Button calls, SB calls.

Turn: (12.50 BB) J[img]/images/graemlins/heart.gif[/img] <font color="blue">(4 players)</font>
<font color="CC3333">SB bets</font>, Hero calls, MP2 folds, <font color="CC3333">Button raises</font>, SB calls, Hero calls.

River: (18.50 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
SB checks, <font color="CC3333">Hero bets</font>, Button calls, SB folds.

Final Pot: 20.50 BB

Except for the flop cap I had been passive... but I didn't want to risk the river getting checked through. Wrong?