Call/Check AK

[ix.spider.uk]

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

SB: $24.75
BB: $24.65
UTG: $9.50
MP: $24.50
Hero (CO): $14.65
BTN: $53.35

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (CO)
UTG folds, <font color="red">MP raises to $1</font>, Hero calls $1, 2 folds, BB calls $0.75

Flop: ($3.10) 7[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">BB bets $2</font>, MP folds, Hero calls $2

Turn: ($7.10) J[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, Hero checks

River: ($7.10) 3[img]/images/graemlins/club.gif[/img] (2 Players)
BB checks, Hero checks

Results: $7.10 Pot ($0.30 Rake)
BB showed T[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] (a pair of Kings) and LOST (-$3 NET)
Hero showed A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (a pair of Kings) and WON $6.80 (+$3.80 NET)

Is this a call/check because of the board/chances he has two pair/trips etc or should I reraise flop/value bet turn or river? Have no reads on villain I only just joined the table.