50NL Flop Trips, Turn Action

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Just sat down, no reads on villain...

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

BB: $52.40
UTG: $50.50
MP: $13
CO: $28.30
BTN: $50.25
Hero (SB): $50.25

Pre-Flop: T[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img] dealt to Hero (SB)
2 folds, CO calls $0.50, BTN folds, Hero calls $0.25, BB checks

Flop: ($1.50) 5[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">Hero bets $1.50</font>, BB calls $1.50, CO folds

Turn: ($4.50) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $4</font>, <font color="red">BB raises to $12</font>, Hero calls $8

River: ($28.50) K[img]/images/graemlins/club.gif[/img] (2 Players)
Hero ???


or are you playing the turn differently?