OK I'm a fish so I called.

$2.5/$5 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
UTG ($936.00)
CO ($317.85)
BTN ($469.48)
SB ($512.00)
Hero ($946.40)
[CO posted $5]

Pre-flop: ($12.50, 5 players) Hero is BB
UTG raises to $17, CO calls $12, 1 fold, SB raises to $56, Hero calls $51, UTG calls $39, CO calls $39

Flop: ($226.50, 4 players)
SB checks, Hero ($890.4)?