Did I Get Lucky On The Turn? (Props To Garland)

[Spladle Master]

Villain: ( $100.60 )
Hero: emithebug ( $97 )
Hero posts small blind [$0.50].
Villain posts big blind [$1].
** Dealing down cards **
Dealt to Hero [ 4[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/spade.gif[/img] ]
1 fold.
Hijack calls [$1].
CO calls [$1].
Button folds.
Hero calls [$0.50].
Villain raises [$3].
Hijack folds.
CO calls [$3].
Hero calls [$3].
** Dealing Flop ** [ K[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/heart.gif[/img] ]
Hero checks.
Villain checks.
CO checks.
** Dealing Turn ** [ 4[img]/images/graemlins/heart.gif[/img] ]
Hero checks.
Villain bets [$4].
CO folds.
Hero raises [$12].
Villain raises [$20].

Hero . . . ?

Hero calls [$12].
** Dealing River ** [ 6[img]/images/graemlins/spade.gif[/img] ]
Hero checks.
Villain is all-In [$72.60]

Hero . . . ?