BB garbage flops big draw

[McG]

PokerStars 0.25/0.50 Hold'em (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, <font color="#666666">2 folds</font>, MP3 calls, CO calls, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: (5 SB) 8[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+2 folds, MP3 calls, CO calls, SB calls.

Turn: (4.50 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">CO raises</font>, SB calls, Hero calls, MP3 folds.

River: (11.50 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, CO ?, SB ?.

I think I played this hand okay except for the turn. Checking and then calling two bets cold seems weak, but I couldn't see leading the turn into a large field without a made hand, and the odds were there to call two bets back even assuming the straight outs were no good, so I'm not sure how else to play it. Then too, maybe I should have discounted for the possibility that someone had the A[img]/images/graemlins/club.gif[/img].