PokerStars Pot-Limit Omaha High, $0.50 BB (9 handed)

MP1 ($36.95)
MP2 ($50)
MP3 ($62.85)
CO ($41.15)
Hero ($49.25)
SB ($240.95)
BB ($105.05)
UTG ($66.95)
UTG+1 ($49.85)

Preflop: Hero is Button with , , , . MP2 posts a blind of $0.50.
2 folds, MP1 calls $0.50, MP2 (poster) checks, MP3 calls $0.50, CO calls $0.50, Hero calls $0.50, 1 fold, BB checks.

Flop: ($3.25) , , (6 players)
BB checks, MP1 checks, MP2 checks, MP3 checks, CO checks, Hero checks.

Turn: ($3.25) (6 players)
BB checks, MP1 checks, MP2 checks, MP3 checks, CO checks, Hero checks.

River: ($3.25) (6 players)
BB checks, MP1 checks, MP2 checks, MP3 bets $3.1, CO folds, Hero ???

no straights, board unpaired and you have second to nuts. Do you call with no read on player? Who pot bets a low flush or trips on the river like this?

I would call.