PokerStars No-Limit Hold'em, $0.25 BB (5 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

I question my turn bet
Hero (BB) ($25)
UTG ($44.45)
MP ($23.50)
Button ($22.55)
SB ($7)

Preflop: Hero is BB with Q, K
1 fold, MP bets $0.75, 1 fold, SB calls $0.65, Hero calls $0.50

Flop: ($2.25) Q, 3, 2 (3 players)
SB checks, Hero bets $1.85, MP calls $1.85, 1 fold

Turn: ($5.95) A (2 players)
Hero bets $2, MP calls $2

River: ($9.95) 8 (2 players)
Hero checks, MP bets $6, Hero ????