This is my 3rd hand at the table, the bb is 13/10 over 90 hands

PokerStars No-Limit Hold'em, $0.50 BB (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($49.80)
SB ($49.75)
BB ($52.25)
UTG ($65.35)
MP1 ($29.65)
MP2 ($52.25)
Hero ($50)

Preflop: Hero is CO with A, 4.
3 folds, Hero raises to $2, 2 folds, BB calls $1.50.

Flop: ($4.25) 3, 2, 2 (2 players)
BB checks, Hero bets $3, BB calls $3.

Turn: ($10.25) 5 (2 players)
BB bets $3, Hero raises to $9, BB raises to $15, Hero ?