Just joined the table so no reads on the the villain.

With his bet on the turn really having a hard time working out what cards he should be on. I dont see him having a straight and I dont think he has a higher pair so I think he most likely has something like top pair with a decent kicker. Am I right in thinking I should just be calling here?

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com



MP ($11)
CO ($24.60)
Button ($10.50)
SB ($7.20)
BB ($4.65)
Hero (UTG) ($9.85)

Preflop: Hero is UTG with J, J
Hero raises to $0.40, 1 fold, CO calls $0.40, 1 fold, SB calls $0.35, 1 fold

Flop: ($1.30) 4, 3, 9 (3 players)
SB checks, Hero bets $1.10, CO calls $1.10, 1 fold

Turn: ($3.50) 6 (2 players)
Hero bets $3, CO raises to $6.40, [color=#CC3333]Hero ???