Flush card comes on river, improves my hand.

[n4rf]

Full Tilt No-Limit Hold'em, $0.10 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($42.65)
MP ($17.10)
Hero ($9.85)
Button ($10.85)
SB ($8.55)
BB ($11.40)

Preflop: Hero is CO with J[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises to $0.35</font>, <font color="#666666">1 fold</font>, Hero calls $0.35, <font color="#666666">2 folds</font>, BB calls $0.25.

Flop: ($1.10) 2[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets $0.8</font>, BB calls $0.80, UTG calls $0.80.

Turn: ($3.50) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, Hero checks.

River: ($3.50) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, Hero? Check/bet?


What can my villains be calling the flop with here? Flush draw makes sense but do I check behind or bet?