TT got bet at river

PokerStars - €0.02 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

SB: 105 BB (VPIP: 25.64, PFR: 20.00, 3Bet Preflop: 10.53, Hands: 1,994)
BB: 283.5 BB (VPIP: 72.41, PFR: 20.69, 3Bet Preflop: 2.44, Hands: 89)
UTG: 197.5 BB (VPIP: 24.91, PFR: 21.41, 3Bet Preflop: 7.56, Hands: 2,643)
Hero (CO): 100 BB
BTN: 261.5 BB (VPIP: 22.73, PFR: 11.36, 3Bet Preflop: 0.00, Hands: 46)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has T♠ T♦

fold, Hero raises to 3 BB, fold, SB calls 2.5 BB, BB calls 2 BB

Flop: (9 BB, 3 players) 7♥ 2♣ 6♣
SB checks, BB checks, Hero bets 5.5 BB, SB calls 5.5 BB, fold

Turn: (20 BB, 2 players) 6♠
SB checks, Hero checks

River: (20 BB, 2 players) A♣
SB bets 14 BB, fold

I think I made a mistake and I should have shot a second barrel with the six doubling down.