$50NL- 4-bet or call with Q's pf against unknown

[slimon]

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 3 Players
LeggoPoker.com - Hand History Converter

BTN: $54.70
SB: $50.25
Hero (BB): $51.65

Pre-Flop: Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/club.gif[/img] dealt to Hero (BB)
<font color="red">BTN raises to $2</font>, <font color="red">SB raises to $7</font>, Hero calls $6.50, BTN folds

Flop: ($16) 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $12</font>, SB folds

Results: $16 Pot ($0.80 Rake)
Hero mucked Q[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/club.gif[/img] and WON $15.20 (+$8.20 NET)

Villian is 20/20 over 15 hands so I don't know much about him. Against unknowns are you more inclined to 4-bet or just call the 3-bet? I'm guessing I'm going broke over any flop that is lower than Q's right with both of us having 100xbb stacks.