Gutshot turns into trips...confused

[akak]

Villain is 41/5.9/1.1 after 17 hands, so relatively unknown. I hadn't seen him do anything noticeable.

Ultimate Bet No-Limit Hold'em, $.02 BB (6 handed) Hand History converter Courtesy of PokerZion.com

UTG ($4.71)
Hero ($1.97)
CO ($.99)
Button ($3.16)
SB ($2.31)
BB ($1.79)

Preflop: Hero is MP with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.02, <font color="#CC3333">Hero raises to $0.09</font>, <font color="#666666">1 fold</font>, Button calls $0.09, <font color="#666666">1 fold</font>, BB calls $0.07, UTG calls $0.07.

Flop: ($0.37) 8[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">BB bets $0.02</font>, UTG calls $0.02, Hero calls $0.02, <font color="#CC3333">Button raises to $0.2</font>, BB folds, UTG calls $0.18, Hero calls $0.18.

I'm getting about 4-1 here and I'm closing the action with a gutshot and two overcards so I call. Might be questionable.

Turn: ($0.99) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, Hero checks, <font color="#CC3333">Button bets $0.2</font>, UTG folds, Hero calls $0.20.

Ok, I got TPTK but I could easily be behind to AQ or AJ, so I want to keep the pot small and get to showdown.

River: ($1.39) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $0.2</font>, Hero...

What's your play here?