DBB Straight Draw. Help me with the maths on this one

Poker Stars
No Limit Holdem Ring game
Blinds: $0.25/$0.50
9 players
Converter

Pre-flop: (9 players) Hero is CO with 7:spade: 6:diamond:
5 folds, Hero (poster) checks, Button folds, SB calls $0.25, BB (poster) checks.

Flop: T:heart: 4:heart: 8:diamond: ($1.5, 3 players)
SB bets $2, BB folds, Hero calls $2.

Turn: K:diamond: ($5.5, 2 players)
SB bets $2.5, Hero calls $2.5.

River: 5:diamond: ($10.5, 2 players)
SB bets $5, Hero raises to $15, SB folds.
Uncalled bets: $10 returned to Hero.

Results:
Final pot: $20.5


OK preflop i was sitting out the hand before so i paid the extra BB to join in the CO...

flopped double inside straight draw.

i think flop call is bad
turn call is good
bet the river, despite flush poss

you?

If I call the flop then I'm raising the turn.