A4o vs midstacker

iPoker - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BB: 40 BB (VPIP: 20.98, PFR: 17.80, 3Bet Preflop: 7.32, Hands: 1,825)
UTG: 119.28 BB (VPIP: 19.72, PFR: 16.51, 3Bet Preflop: 5.49, Hands: 222)
MP: 38.28 BB (VPIP: 29.69, PFR: 26.91, 3Bet Preflop: 8.48, Hands: 474)
CO: 105.18 BB (VPIP: 25.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
BTN: 140.62 BB (VPIP: 21.16, PFR: 18.26, 3Bet Preflop: 8.97, Hands: 636)
Hero (SB): 100 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♣ 4♥

fold, fold, fold, fold, Hero raises to 3 BB, BB calls 2 BB

Flop: (6 BB, 2 players) 6♠ 3♦ 7♠ Hero checks, BB bets 3.6 BB, Hero raises to 12 BB, fold

Hero shows A♣ 4♥ (High Card, Ace)
Hero wins 12.54 BB

IS raise ok here? He is shortstacker regg, and he 3bets all PP, AQ+ and calls mostly with broadways. So I check raise here because I expect him to fold a lot on this board plus I have gutshot.