Big pot, do I just keep calling?

[Chobohoya]

SB is 25/17/1.93, MP is 31/13/1.68

Party Poker 5/10 Hold'em (6 max, 6 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">2 folds</font>, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP calls, SB calls.

Flop: (9 SB) A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, <font color="#CC3333">SB 3-bets</font>, <font color="#CC3333">Hero caps</font>, MP calls, SB calls.

Turn: (10.50 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls, <font color="#CC3333">MP raises</font>, SB calls, Hero calls.

River: (16.50 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP bets</font>, SB calls, Hero calls.

Final Pot: 19.50 BB

I think if I'm facing two cold after the turn, I have a fold. I'm no fan of the fold button, but I thought about it. So should I bring myself to fold getting 11-1, then 15.5-1, then 18.5-1?