NL 25: two pair facing check-raise

[M.P.Rator]

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: ITH Forums)

SB ($31.95)
Hero ($26.60)
UTG ($25)
MP ($30.05)
CO ($25.95)
Button ($35.45)

Preflop: Hero is BB with :td, :9d.
4 folds, SB completes, Hero raises to $1, SB calls $0.75.

Flop: ($2) :jc, :9c, :th (2 players)
SB checks, Hero bets $1.25, SB calls $1.25.

Turn: ($4.50) :2c (2 players)
SB checks, Hero bets $3, SB raises to $10, Hero folds.

Final Pot: $10.50

SB: 56/27/1, 64 hände
normalerweise bette ich den flop grösser, weiss nicht mehr, was ich mir dabei gedacht habe. fold ok?