NL$100 KK vs a nit

[orentha]

PokerStars No-Limit Hold'em, $1.00 BB (7 handed) Hand History converter Courtesy of PokerZion.com

MP1 ($205.55)
MP2 ($55.50)
Hero ($120.25)
Button ($131.45)
SB ($52.70)
BB ($129.55) ---> 7/3 over 300 hands
UTG ($18)

Preflop: Hero is CO with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $4</font>, <font color="#666666">2 folds</font>, BB calls $3.

Flop: ($8.50) 7[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $5</font>, Hero calls $5.

<font color="#666666">Should I be raising here? His lead was kinda fishy... so I decided to just call and see what the turn brought </font>

Turn: ($18.50) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $12</font>, Hero ????