Raise turn fold to threebet?

[ISF]

I unfortunatly dont have any reads as I just sat down. Should I fold to this threebet? I figure I have up to eight outs and at least two, I discounted them to about 4 so felt it was close. Should I call this turn and fold the river unimproved? Anyone just call down?
Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is CO with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, SB calls, BB calls.

Flop: (6 SB) 9[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, Hero calls, SB calls.

Turn: (4.50 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, SB folds, <font color="#CC3333">BB 3-bets</font>, Hero folds.

Final Pot:
9.50 BB