PokerStars No-Limit Hold'em, $0.10 BB (5 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($11.95)
BB ($5.15)
UTG ($11.95)
MP ($8.30)
Hero ($16.85)

Preflop: Hero is Button with Q, Q.
1 fold, MP calls $0.10, Hero raises to $0.5, 2 folds, MP calls $0.40.

Flop: ($1.15) J, 6, 5 (2 players)
MP checks, Hero bets $0.7, MP calls $0.70.

Turn: ($2.55) J (2 players)
MP checks, Hero bets $1.6, MP calls $1.60.

River: ($5.75) 8 (2 players)
MP bets $2, Hero ???

Just sat down, no data or reads on villian. What does he have? What should I do?