PokerStars No-Limit Hold'em, $0.25 BB (7 handed) FTR converter on zerodivide.cx

UTG ($8.50)
MP1 ($16.10)
MP2 ($19.75)
CO ($40.75)
Hero ($24.25)
SB ($5.95)
BB ($30.45)

Preflop: Hero is Button with Q, A.
3 folds, CO raises to $1, Hero calls $1, 2 folds.

Flop: ($2.35) Q, 5, 7 (2 players)
CO bets $2, Hero raises to $4.5, CO raises to $7, Hero calls $2.50.

Turn: ($16.35) 6 (2 players)
CO bets $14, Hero folds.

Final Pot: $30.35

It didn't feel like a flush, but I wasn't willing to risk it. Afterwards he said he had QK... thoughts?