Have I done the right thing by fold here?
PokerStars No-Limit Hold'em, 0 Tournament, 350/700 Blinds 85 Ante (8 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

saw flop | saw showdown
UTG+1 (t15908)
MP1 (t86705)
MP2 (t4840)
CO (t12988)
Button (t22263)
SB (t10040)
Hero (BB) (t11885)
UTG (t69237)
Hero's M: 6.87

Preflop: Hero is BB with 9♥, K♥
1 fold, UTG+1 calls t700, 4 folds, SB calls t350, Hero checks
Flop: (t2780) A♠, A♦, 9♠ (3 players)
SB checks, Hero checks, UTG+1 checks
Turn: (t2780) 2♥ (3 players)
SB bets t2100, Hero calls t2100, 1 fold
River: (t6980) 3♥ (2 players)
SB bets t7155 (All-In), Hero folds
Total pot: t6980
Main pot: t6980 returned to SB
Results:
SB didn't show
Outcome: SB won t6980
