correct to draw?

Am I correct to draw here? I'm reading Yao's book, and am learning to calculate the EV of my plays. If this is an incorrect draw, can someone show me why? Thanks!

The SB has been playing 60%+ of the last 100 hands. The BB has lost 30 BBs in the last 30-40 hands, showing down unsuited single gappers, and small aces (in bad places..I think) ... very aggressive, but not showing down enough for me to label loose. The CO poster is an unknown.

PokerStars 1/2 Hold'em (10 handed) converter

Preflop: Hero is Button with Q[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $1.50.
<font color="#666666">6 folds</font>, CO (poster) checks, Hero calls, SB completes, BB checks.

Flop: (4.50 SB) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, CO calls, Hero calls, SB calls.

Turn: (4.25 BB) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, CO folds, Hero calls, SB calls.

River: (7.25 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, SB calls, <font color="#CC3333">BB 3-bets</font>, <font color="#CC3333">Hero caps</font>, SB calls, BB calls.

Final Pot: 17 BB