I made nut straight on the turn when the flush got there PS $300

[MaverickUSC]

Poker Stars, $300 + $20 NL Hold'em Tournament, 50/100 Blinds, 9 Players
LeggoPoker.com - Hand History Converter

BB: 2,820
UTG: 3,395
UTG+1: 2,220
UTG+2: 4,225
MP1: 3,175
MP2: 2,945
CO: 4,835
Hero (BTN): 6,225
SB: 3,005

Pre-Flop: (150) 8[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
2 folds, UTG+2 calls 100, 2 folds, CO calls 100, Hero calls 100, SB calls 50, BB checks

Flop: (500) A[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img] (5 Players)
SB checks, BB checks, UTG+2 checks, <font color="red">CO bets 200</font>, Hero calls 200, SB calls 200, BB calls 200, UTG+2 folds

Turn: (1,300) 5[img]/images/graemlins/heart.gif[/img] (4 Players)
SB checks, <font color="red">BB bets 400</font>, CO calls 400, <font color="red">Hero raises to 1,620</font>

thoughts? if sb jams obv call? what if co shoves?

my image is nitty, BB unknown, CO is varuni