[SH-NL04] - Flop Game

Hello Guys... What do you guys think about my reRaise on the Flop? should I've
Bet the Flop instead of check/raise? or should I made a strong ReRaise Bet?

Merge - $0.04 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 3

MP: $4.00
CO: $4.20
BTN: $3.40
SB: $4.00
Hero (BB): $4.00
UTG: $1.03

SB posts SB $0.02, Hero posts BB $0.04

Pre Flop: ($0.06) Hero has A♠ 6♠

fold, fold, fold, BTN calls $0.04, SB calls $0.02, Hero checks

Flop: ($0.12, 3 players) A♣ 5♥ 6♥
SB checks, Hero checks, BTN bets $0.04, fold, Hero raises to $0.19, BTN calls $0.15

Turn: ($0.50, 2 players) 8♠
Hero bets $0.37, BTN calls $0.37

River: ($1.24, 2 players) 9♥
Hero checks, BTN bets $0.24, Hero calls $0.24

BTN shows 7♠ 4♠ (Straight, Nine High) (Pre 36%, Flop 30%, Turn 91%)
Hero shows A♠ 6♠ (Two Pair, Aces and Sixes) (Pre 64%, Flop 70%, Turn 9%)
BTN wins $1.64

Thanks!!