OPP weak hand correct play on river?

[!Luck]

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($25)
MP ($13.75)
Button ($12.80)
Hero ($37.55)
BB ($15)

Preflop: Hero is SB with Q, J.
1 fold, MP calls $0.25, 1 fold, Hero completes, BB checks.

Flop: ($0.75) 7, 9, J (3 players)
Hero bets $0.5, BB calls $0.50, MP folds.

Turn: ($1.75) 2 (2 players)
Hero bets $1.25, BB calls $1.25.

River: ($4.25) 7 (2 players)
Hero checks, BB checks.

Final Pot: $4.25

Comments on all streets apperciated. Assume standard 25nl villian

[zenbitz]

How big a bet will you call? I think it's fine, but you should have some idea what you are willing to call on the end. I would say $3 tops.

[!Luck]

Would a $2 dollar block bet be a good idea?