Just sat down at table, no reads on opponent. I had 3-bet him earlier and pushed him off his hand. How often enough is this AK or JJ- for me to call this?

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) from (Format: Bet The Pot)

Hero ($54.85)
Button ($49.25)
SB ($79.75)
BB ($116.80)
UTG ($50)
MP ($59.20)

Preflop: Hero is CO with , .
1 fold, MP raises to $2, Hero raises to $6, 3 folds, MP raises to $59.2, Hero ???

depends who the 4bet comes from..