I'd only been at the table for maybe 10 hands, so I didn't have any good reads on CO. In one hand that went to showdown, he called with 77 in the SB and checked a 33TJ5 board on all streets.

Is it bad to call here and see what he does on the turn? Should I be folding? It seems nitty to fold but I have no plan for later streets so I don't know.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($32.80)
SB ($7)
Hero (BB) ($97.25)
UTG ($56.90)
MP ($29.90)
CO ($90.15)

Preflop: Hero is BB with 7, 7
2 folds, CO raises to $2, 1 fold, SB calls $1.75, Hero calls $1.50

Flop: ($6) 3, 4, 6 (3 players)
SB checks, Hero bets $4.25, CO raises to $8.50, 1 fold, Hero ...?