Wrong to pay it off?

[kingstalker]

UB 3+0 rebuy tournament
Blinds 100/200 I have 5700 in chips
I have [img]/images/graemlins/diamond.gif[/img]Q [img]/images/graemlins/diamond.gif[/img]K in BB,one limper
Flop is [img]/images/graemlins/spade.gif[/img]2 [img]/images/graemlins/diamond.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]J
I check, and my opponet checks, Wish I had bet it here
Turn [img]/images/graemlins/diamond.gif[/img]8
Here I raise to about 800 and my opponet calls
River is [img]/images/graemlins/diamond.gif[/img]7
Here I push all in and my oppont calls me with [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/club.gif[/img]4 with a ace high flush,Im thinking me pushing all in was a terrible mistake because the only hand he could have to call me with would be either the [img]/images/graemlins/diamond.gif[/img]10 for a straight flush or a [img]/images/graemlins/diamond.gif[/img]A, should I just checked it and perhaps even folded if he came out swinging on the river?