obviously after i 3 bet i have to call as im getting super sick odds but should i have 3 bet this in the first place. Am i ok in thinking that they might not have the flush but just the As although when the guy behind me flats i think he probably has it, im getting 3 to 1 when we get all in so i think im getting the odds.

PokerStars Zoom No-Limit Hold'em, $0.25 BB (6 handed) - PokerStars Converter Tool from FlopTurnRiver.com

Button ($37.17)
SB ($4.88)
BB ($48.57)
Hero (UTG) ($31.79)
MP ($28.71)
CO ($98.95)

Preflop: Hero is UTG with Q, Q
Hero bets $0.75, 1 fold, CO calls $0.75, 2 folds, BB calls $0.50

Flop: ($2.35) 3, 5, Q (3 players)
BB checks, Hero bets $1.25, CO raises to $4.56, BB calls $4.56, Hero raises to $16, CO raises to $54.80, BB calls $43.26 (All-In), Hero calls $15.04 (All-In)

Turn: ($129.03) 3 (3 players, 2 all-in)

River: ($129.03) 7 (3 players, 2 all-in)

Total pot: $129.03 | Rake: $2

BB seems pretty likely to have nut flush when he checks and then flats CO's initial raise (unless he's just a fish). You only have about 35% equity showdown against a made flush and you have no fold equity. Even if both of them have a range consisting sets, made flushes, AsQh and As5x combos and a few naked A draws - i.e., {JcJs,JdJs,JhJs,TcTs,TdTs,ThTs,55,33,AsJs,AsTs,As9 s,As8s, As7s,As6s,As4s,As2s,KsJs,KsTs,JsTs,Js9s,Ts9s,9s8s, 8s7s,7s6s,AsQh,AsJc,AsJd,AsJh,As5c,As5d,As5h}, you only have 44% showdown equity (and still no fold equity), so you don't want to 3bet.

You close the action with a call, but you're likely only going to get to see the turn. Still, you have a 15% chance of hitting your boat on the turn, and while you're not getting the express odds to call, you're probably going to collect at least one decent sized bet if you hit, so you should have the implied odds.

Edit: If they both have the wide range, I think you could in fact 3bet, because you have better than 50% equity if one of them folds and you have better than 33% equity if they both call. However, I think it's very unlikely that they both have this range - I think BB's range has to be weighted towards the nut flush.

Actually, I changed my mind. I think the 3bet is OK. You have 35% showdown equity if you get it in against both villains and one or both has a made flush. You need 33% equity for your 3bet to be breakeven. More importantly, CO is going to fold some percentage of the time after the BB flats and you 3bet, in which case you will be head's up against BB if he just calls (in which case he is unlikely to donk the turn and you can check back to see the river if you miss turn) and and an easy call if BB 4bet shoves (which seems unlikely given his flat of CO's 3bet).

All depends on how wide of a calling range he has PF Vs your UTG open. If it is a normal range of Good broadways and pocket pairs you have his flop raising range crushed

it's fine