NL25 - Improper play chasing nut flush?

[hammerva]

No real reads on the guy except that he played few hands.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
9 players
Converter

Stack sizes:
UTG: $30.65
UTG+1: $15.40
Hero: $19.80
MP2: $5.55
MP3: $25.10
CO: $31.10
Button: $24.65
SB: $22.55
BB: $8.35

Pre-flop: (9 players) Hero is MP1 with Q[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $1</font>, 3 folds, Button calls, SB folds, BB calls.

Flop: 9[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img] ($3.1, 3 players)
BB checks, Hero checks, Button checks.

Turn: 3[img]/images/graemlins/heart.gif[/img] ($3.1, 3 players)
BB checks, <font color="#cc0000">Hero bets $2.25</font>, Button folds, <font color="#cc0000">BB raises to $4.5</font>, Hero calls.

River: 8[img]/images/graemlins/heart.gif[/img] ($12.1, 2 players)
<font color="#cc0000">BB is all-in $2.85</font>, Hero calls.

Results:
Final pot: $17.8

I figured that the min-raise on the turn was him hitting his flush but since I have a nut flush and have the odds to call. I guess my question is whether I should have seen this coming with the check on the flop or just chalk it up to a bad beat.

thanks [img]/images/graemlins/crazy.gif[/img]