Pocket 5s blind steal attempt

[thesharpie]

BB is 28/0 with 0.13 postflop AF over 18 hands, his gone to showdown is ~14%. Is this enough to fold the flop or is the sample too small? Button has limped open limped AQs on the cutoff before and raised a FD+OCs on the flop..

Party Poker 1/2 Hold'em (9 max, 7 handed) converter

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

Flop: (6.50 SB) T[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, Button calls, BB calls.

Turn: (6.25 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, Button calls, BB calls.

River: (9.25 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero checks, Button checks.

Final Pot: 9.25 BB