Flopped Two Pair.. am I beat?

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($440.80)
CO ($312)
Hero ($548.20)
SB ($334.65)
BB ($657.65)
UTG ($295.10)

Preflop: Hero is Button with 3http://www.flopturnriver.com/phpBB2/...iles/spade.gif, Ahttp://www.flopturnriver.com/phpBB2/...iles/spade.gif.
UTG raises to $8, 2 folds, Hero calls $8, SB calls $6, BB calls $4.

Flop: ($32) 4http://www.flopturnriver.com/phpBB2/...iles/spade.gif, 3http://www.flopturnriver.com/phpBB2/...es/diamond.gif, Ahttp://www.flopturnriver.com/phpBB2/...iles/heart.gif (4 players)
SB checks, BB checks, UTG checks, Hero bets $20, SB raises to $60, BB folds, UTG folds, Hero calls $40.

Turn: ($152) 8http://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
SB bets $266.65 and is all-in

Hero pukes

Looks like 44 or 33 or nothing to me. Gotta pick the rite one!

two pair looks to me to be the most dangerous NL hand.

and cold calling with A3 even to a minraise?

I think this is a call because of the turn. You may fold the flop though. He's overbetting the pot on a non-scary board, which would be retarded with a set. I think a lot this is a semi bluff or 43.