Value bet here? 10nl

[Peleus]

Poker Stars - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 9 Players - (LegoPoker Hand History Converter)

SB: $12.30
Hero (BB): $13.55
UTG: $4.05
UTG+1: $11.85
MP1: $3.50
MP2: $5.40
MP3: $28.10
CO: $11.00
BTN: $4.70

Preflop: Hero is dealt A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (9 Players)
5 folds, CO calls $0.10, BTN folds, SB calls $0.05, <font color="red">Hero raises to $0.50</font>, CO calls $0.40, SB folds

Flop: ($1.10) 6[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $0.60</font>, <font color="red">CO raises to $1.50</font>, Hero calls $0.90

Turn: ($4.10) A[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $2.00</font>, Hero calls $2.00

River: ($8.10) 7[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero ????

Villain running at 37/0/3 over only 21 hands.

I do have trips, however I feel there is a reasonable chance I'm up against a set. Is checking here awful, or a reasonable move?