Does this make me a coward?

[Bez]

Ultimate Bet 1/2 Hold'em (6 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is Button with A/images/graemlins/heart.gif, Q/images/graemlins/heart.gif.
UTG folds, MP folds, CO calls, <font color="#CC3333">Hero raises</font>, SB calls, BB calls, CO calls.

Flop: (8 SB) Q/images/graemlins/diamond.gif, 4/images/graemlins/club.gif, 9/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Hero raises</font>, SB calls, BB folds, CO calls.

Turn: (7 BB) 8/images/graemlins/heart.gif <font color="#0000FF">(3 players)</font>
SB checks, CO checks, <font color="#CC3333">Hero bets</font>, SB calls, CO calls.

River: (10 BB) 3/images/graemlins/diamond.gif <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">CO bets</font>, Hero calls, SB folds.

Final Pot: 12 BB

Should I raise this river? Bet from nowhere had me worries about a straight slowplayed on the turn or more obviously a flush (wouldn't this be check-raised?). This is 6-max so making fancy plays happens quite alot but as I've been betting all the way, a bet without a better hand than mine makes no sense. Any thoughts at to what CO might have?

[Shillx]

This "bet from nowhere" almost always means a flush or a stone bluff. If CO a tricky player, the this is an easy call. He will reraise you with the flush and fold if he is bluffing. Also, getting an overcall is another bonus here.

Brad

[Ianco15]

I agree a river call is the correct play in this situation for the reasons Shillx gave.

[kenberman]

try posting this in the HUSH forum.
that said, a call on the river is good. CO bet screams flush or raggedy 2 pair

[SCfuji]

not at all. this hand looks good.

[Bez]

Thanks for the replies everyone.