so am I seeing monsters here or is there a reason I shouldn't raise this river? if os how much?

oh also before I get skewered on my preflop play, I raised and won the flop the last 4 hands with pocket pairs so I didnt raise here because I figured I was due for a re-pop

Poker Stars
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players


Stack sizes:
UTG: $96
hero: $127.40
Button: $332.40
SB: $153.15
BB: $109.50

Pre-flop: (5 players) hero is CO with
UTG calls, hero calls, Button calls, SB raises to $5, BB folds, UTG calls, hero calls, Button calls.

Flop: ($21, 4 players)
SB checks, UTG checks, hero checks, Button checks.

Turn: ($21, 4 players)
SB checks, UTG checks, hero checks, Button checks.

River: ($21, 4 players)
SB bets $12, UTG folds, hero ??

AI. Theres a good chance of being called and given the others players behaviour, there is a much better chance of him holding a K-something than QQ. 55 is possible too but you would loose your stack if re-raised anyway. Wouldnt you ?

Standard 'raise fold to a push' hand.