NL25, flopped two pair, check raised turn....

[pacman2k7]

Villain is unknown.

Should I just check behind for pot control?

Party Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $40.24
BB: $37.51
UTG: $23.65
MP: $25.00
Hero (CO): $30.94
BTN: $29.20

Preflop: Hero is dealt 8[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] (6 Players)
2 folds, <font color="red">Hero raises to $1.00</font>, BTN calls $1.00, SB calls $0.90, BB calls $0.75

Flop: ($4) 3[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (4 Players)
SB checks, BB checks, <font color="red">Hero bets $2.75</font>, 2 folds, BB calls $2.75

Turn: ($9.50) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $7.00</font>, <font color="red">BB raises to $21.00</font>, [i]Hero ???