Easy flop fold?

[arch12]

At the time I thought this was a pretty rountine fold, but the size of the pot got me thinking whether it's worth taking a shot at. Only played a few hands on the table so no reads. Thoughts?

Preflop: Hero is BB - dealt 9 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/club.gif[/img]
<font color="#666666">6 call</font>, Hero checks

Flop (<font color="red">7 players</font>): 4 [img]/images/graemlins/club.gif[/img] 5 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/heart.gif[/img]
<font color="blue">SB bets</font>, Hero folds