25nl overpair deep

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Dont know what to do here on the turn, or maybe i should just have folded on the flop? No reads, only played 15 hands this session so no stats.
Line check, pls

Party Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $24.75
BB: $24.22
UTG: $24.28
CO: $44.92
Hero (BTN): $50.45

Preflop: Hero is dealt Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG folds, <font color="red">CO raises to $1.00</font>, <font color="red">Hero raises to $3.50</font>, 2 folds, CO calls $2.50

Flop: ($7.35) 3[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (2 Players)
CO checks, <font color="red">Hero bets $5.00</font>, <font color="red">CO raises to $14.00</font>, Hero calls $9.00

Turn: ($35.35) 9[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">CO bets $20.00</font>, <font color="red">Hero ??