63s NL50 turned flush, getting action

[Echelon]

i play a standard TAG game. (19/14/3.5)

BB is 31/8/5.5 over 120 hands
Button is unknown

just call his turn raise?

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) pokerhand.org hand converter

CO ($50)
Button ($29.90)
Hero ($50.25)
BB ($39.05)
UTG ($66)
MP ($33.60)

Preflop: Hero is SB with 6[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.50, <font color="#666666">2 folds</font>, Button calls $0.50, Hero completes, BB checks.

Flop: ($2) 4[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, <font color="#CC3333">BB bets $1.5</font>, UTG folds, Button calls $1.50, Hero calls $1.50.

Turn: ($6.50) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $4.5</font>, <font color="#CC3333">BB raises to $9</font>, Button folds, <font color="#CC3333">Hero raises to $35.5</font>, <font color="#CC3333">BB raises to $37.05</font>, Hero calls $1.55.

River: ($80.60) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: $80.60