How was this played?

[plummy1013]

This hand occured about 15 minutes into my time at this table so I don't really have any good reads.

PokerStars 0.25/0.50 Hold'em (9 handed) converter

Preflop: Plummy1013 is UTG with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">Plummy1013 raises</font>, <font color="#666666">6 folds</font>, SB calls, BB calls.

Flop: (6 SB) 6[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Plummy1013 bets</font>, SB calls, BB calls.

Turn: (4.50 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, Plummy1013 checks.

River: (4.50 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, <font color="#CC3333">Plummy1013 raises</font>, <font color="#CC3333">SB 3-bets</font>, BB folds, Plummy1013 calls.

Final Pot: 11.50 BB

What I am wondering is if I could have folded this river after his bet, due to the threat of reverse domination. Should I have just called? I really just got carried away by the sight of the ace and forgot the tendency of player to play any ace. Thanks for any input,

-Plummy1013