JJ in LP - check raised on turn

[ccwhoelse?]

Party Poker 0.5/1 Hold'em (8 handed) converter

Preflop: Hero is CO with J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img].
UTG calls, UTG+1 calls, MP1 calls, MP2 folds, <font color="#CC3333">Hero raises</font>, Button calls, SB calls, BB folds, UTG calls, UTG+1 calls, MP1 calls.

Flop: (13 SB) 8[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, UTG checks, UTG+1 checks, MP1 checks, <font color="#CC3333">Hero bets</font>, Button calls, SB calls, UTG calls, UTG+1 folds, MP1 calls.

Turn: (9 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, UTG checks, MP1 checks, <font color="#CC3333">Hero bets</font>, Button folds, SB folds, UTG folds, <font color="#CC3333">MP1 raises</font>, Hero calls.

River: (13 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP1 bets</font>, Hero calls.

Final Pot: 15 BB

i'm thinking i should fold on the turn.