2 pair up against possible flush

[Eric Draven]

Only 25 or 30 hands on opponent, so stats were pretty useless.

Full Tilt No-Limit Hold'em, $0.10 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($2.55)
SB ($13.90)
Hero ($12.90)
UTG ($5)
MP ($9.95)

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img].
UTG calls $0.10, MP calls $0.10, Button calls $0.10, SB completes, Hero checks.

Flop: ($0.50) A[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets $0.5</font>, <font color="#CC3333">Hero raises to $3</font>, UTG folds, MP folds, Button folds, SB calls $2.50.

Turn: ($6.50) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $6.5</font>, Hero ???

I know I'm not supposed to go broke in unraised pots... but can I fold this against an assumed donk at 10NL?

Thoughts on all streets appreciated.