Is the river bet an instant fold on microstakes because they Always have flush when they bet like this or was my call ok?

PokerStars No-Limit Hold'em, $0.02 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($4.86)
UTG+1 ($5.32)
MP1 ($2.82)
MP2 ($4.08)
Hero ($5.52)
CO ($5.06)
Button ($3.35)
SB ($4.23)
BB ($3.43)

Preflop: Hero is MP3 with 7, 7.
4 folds, Hero raises to $0.08, CO calls $0.08, 2 folds, BB calls $0.06.

Flop: ($0.25) Q, 6, J (3 players)
BB checks, Hero bets $0.18, CO folds, BB calls $0.18.

Turn: ($0.61) 2 (2 players)
BB checks, Hero checks.

River: ($0.61) 7 (2 players)
BB bets $1.06, Hero calls $1.06.

Final Pot: $2.73