[Closed] NL4 flopped trip 9 - scary board

Did I play too fast here? what would have been best?

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.02/$0.04 No-Limit Hold'em (7 handed)
Known players:
[tg]MP2$2.89:///////;MP3$0.57:///////;CO (Hero)$5.69:///////;BU$4.00:///////;SB$3.73:///////;BB$1.26:///////;MP1$5.69:///////;[/tg]
Preflop: Hero is CO with 9:h, 9:d.
MP1 folds, MP2 raises to $0.08, MP3 calls $0.08, Hero calls $0.08, BU calls $0.08, SB folds, BB calls $0.04.

Flop: ($0.42) 9:c, A:c, K:d (5 players)
BB checks, MP2 bets $0.20, MP3 folds, Hero raises to $0.70, BU folds, BB folds, MP2 calls $0.50.

Turn: ($1.82) 3:s (2 players)
MP2 bets $1.29, Hero raises to $4.91(All-In), MP2 calls $0.82.

River: ($8.84) 4:h (2 players)

Final Pot: $8.84.

Results follow:

Hero shows three of a kind, nines(9h 9d).

MP2 shows three of a kind, aces(Ad As).

Hero wins with three of a kind, nines(9h 9d).

MP2 wins with three of a kind, aces(Ad As).