PokerStars No-Limit Hold'em, $1.00 BB (7 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

CO ($128.60)
Hero (Button) ($134.70)
SB ($75.45)
BB ($33.25)
UTG ($100)
MP1 ($98)
MP2 ($39)

Preflop: Hero is Button with K, K
4 folds, Hero bets $3, SB calls $2.50, 1 fold

Flop: ($7) 9, J, 8 (2 players)
SB checks, Hero bets $4, SB calls $4

Turn: ($15) 4 (2 players)
SB bets $20, Hero?