nl200 , trips in unraised pot

[Frawa]

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

BTN: $187.45
SB: $201.10
Hero (BB): $200
UTG: $89.90
MP: $218
CO: $600.80

Pre-Flop: T[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (BB)
2 folds, CO calls $2, 2 folds, Hero checks

Flop: ($5) K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, CO checks

Turn: ($5) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $4</font>, CO calls $4

River: ($13) 4[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $8</font>, <font color="red">CO raises to $106</font>, Hero ?

my first hand at the table no reads at all
who bets the flop? i was going for a c/r for some dumb reason