Just wondering if I played this correctly, any changes you guys would have made?

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($86.75)
UTG+1 ($12.75)
MP1 ($49)
MP2 ($27.25)
MP3 ($60.85)
CO ($149.40)
Button ($41.60)
Hero ($60.45)
BB ($66.60)

Preflop: Hero is SB with A, Q.
4 folds, MP3 calls $0.50, 1 fold, Button calls $0.50, Hero raises to $2.25, 1 fold, MP3 folds, Button calls $1.75.

Flop: ($5.50) 3, 4, 9 (2 players)
Hero bets $3, Button raises to $8, Hero calls $5.

Turn: ($21.50) K (2 players)
Hero checks, Button checks.

River: ($21.50) 3 (2 players)
Hero checks, Button checks.

Final Pot: $21.50

Flop bet a little weak. I would raise you there all day too. I dont know why you called exactly...thinking diamond draw was good, Ace high good?

Can we get some insight on your actions?

Bet 4.00 on the flop. I don't know if calling the flop raise is a good idea. I doubt you are ahead now, but you really don't even know if you have the winning draw. After checking behind turn, it appears that button was drawing to the NFD. I might even be tempted to fire out 12 or so on the river.