First hand of a $2.20MTT pp99 Too aggressive?

[erocplayer]

No reads obv, first hand.
PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button (t1500)
SB (t1500)
BB (t1500)
Hero (t1500)
UTG+1 (t1500)
MP1 (t1500)
MP2 (t1500)
CO (t1500)

Preflop: Hero is UTG with 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t60</font>, <font color="#666666">1 fold</font>, MP1 calls t60, <font color="#666666">4 folds</font>, <font color="#CC3333">BB raises to t140</font>, Hero calls t80, MP1 calls t80.

Flop: (t430) 3[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets t240</font>, MP1 folds, BB calls t240.

Turn: (t910) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t1120 (All-In)</font>, BB folds.

Final Pot: t-210

My logic was that he wouldn't check an overpair two hands in a row, and even though I may be ahead, I wouldn't want to let an A or broadway card fall and have me lose. Is my line on the turn too aggressive?