PokerStars No-Limit Hold'em, $0.05 BB (7 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($10.30)
CO ($8.24)
Button ($2.36)
SB ($1.97)
BB ($6.28)
UTG ($6.36)
MP1 ($2.46)

Preflop: Hero is MP2 with Q, A.
UTG calls $0.05, 1 fold, Hero raises to $0.2, 1 fold, Button calls $0.20, SB calls $0.18, 1 fold, UTG calls $0.15.

Flop: ($0.85) 7, Q, 9 (4 players)
SB checks, UTG checks, Hero bets $0.5, Button raises to $1, SB raises to $1.77, UTG folds, Hero ???

No reads on either players, I just sat down. Does the size of both stacks dictate that I call?

On a side note, I have always been a sng player and just started giving cash games a try, so any comments/suggestions much appreciated.