Or should I check/call river?
No reads, that means he's not a regular.

Party Poker No-Limit Hold'em, $ Hero (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($413.34)
Hero ($196.40)
UTG ($203.20)
MP ($155.12)
CO ($301.71)
Button ($75)

Preflop: Hero is BB with Q, Q. SB posts a blind of $1.
2 folds, CO calls $2, 1 fold, SB (poster) completes, Hero raises to $7, CO calls $7, SB calls $7.

Flop: ($27) J, 8, 3 (3 players)
SB checks, Hero bets $20, CO calls $20, SB folds.

Turn: ($67) 8 (2 players)
Hero checks, CO checks.

River: ($67) T (2 players)
Hero bets $40,