I have to call?

$0.50/$1 Texas Hold'em

Total number of players : 10

Seat 1: janne_is ( $0.75 )
Seat 3: pietro1111 ( $22.50 )
Seat 4: Omokocha ( $15.75 )
Seat 5: TheShoShoSho ( $30.75 )
Seat 6: daveftfh ( $35.11 )
Seat 7: BGirl12 ( $30.25 )
Seat 8: zoo_piggy ( $57.50 )
Seat 9: BenChapleski ( $48.72 )
Seat 10: Dolfan88 ( $45.75 )
Seat 2: Hero ( $43.50 )

TheShoShoSho posts small blind [$0.25].
daveftfh posts big blind [$0.50].

Hero posts big blind [$0.50].

** Dealing down cards **

Dealt to Hero [ 9 [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/heart.gif[/img] ]
BGirl12 calls [$0.50].
BenChapleski calls [$0.50].
Dolfan88 calls [$0.50].
janne_is folds.
Hero checks.
pietro1111 calls [$0.50].
Omokocha raises [$1].
TheShoShoSho calls [$0.75].
daveftfh calls [$0.50].
BGirl12 calls [$0.50].
BenChapleski calls [$0.50].
Dolfan88 calls [$0.50].
Hero calls [$0.50].
pietro1111 calls [$0.50].


** Dealing Flop ** [ 3 [img]/images/graemlins/club.gif[/img], 4 [img]/images/graemlins/spade.gif[/img], T [img]/images/graemlins/diamond.gif[/img] ]

TheShoShoSho checks.
daveftfh checks.
BGirl12 checks.
BenChapleski checks.
Dolfan88 checks.
Hero checks.
pietro1111 checks.
Omokocha bets [$0.50].
TheShoShoSho calls [$0.50].
daveftfh calls [$0.50].
BGirl12 folds.
BenChapleski folds.
Dolfan88 calls [$0.50].
Hero calls [$0.50].
pietro1111 calls [$0.50].



** Dealing Turn ** [ Q [img]/images/graemlins/heart.gif[/img] ]

TheShoShoSho checks.
daveftfh checks.
Dolfan88 checks.
Hero checks.
pietro1111 checks.
Omokocha bets [$1].
TheShoShoSho raises [$2].
daveftfh folds.
Dolfan88 folds.
Hero calls [$2].
pietro1111 calls [$2].
Omokocha raises [$2].
TheShoShoSho calls [$1].
Hero calls [$1].
pietro1111 calls [$1].


** Dealing River ** [ 8 [img]/images/graemlins/club.gif[/img] ]

TheShoShoSho checks.
Hero bets [$1].
pietro1111 folds.
Omokocha raises [$2].
TheShoShoSho calls [$2].
Hero raises [$2].
BenChapleski: nice pot
Omokocha calls [$1].
TheShoShoSho calls [$1].

Hero shows [ 9 [img]/images/graemlins/diamond.gif[/img], J [img]/images/graemlins/heart.gif[/img] ] a straight, eight to queen.
Omokocha doesn't show [ K [img]/images/graemlins/spade.gif[/img], K [img]/images/graemlins/heart.gif[/img] ] a pair of kings.
TheShoShoSho doesn't show [ 5 [img]/images/graemlins/diamond.gif[/img], Q [img]/images/graemlins/diamond.gif[/img] ] a pair of queens.

Hero wins $31 from the main pot with a straight, eight to queen.
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On the flop i thought i had 4% chance to win but i have to pay only 0.50, so if I think the pot will be 12,50 or more at the river i have to call right?