50NL: AKs missed flop; facing a RR

[Foldem78]

After the PF call..I think he's got TT-QQ, AQs+..and some random stuff..check-raise better than CB??

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($49.25)
SB ($40.25)
BB ($11.25)
UTG ($41.40)
UTG+1 ($48.40)
MP1 ($50.35)
MP2 ($47.50)
MP3 ($24.40)
CO ($24.10)

Preflop: Hero is Button with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $2</font>, <font color="#666666">1 fold</font>, MP1 calls $2, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $9.5</font>, <font color="#666666">2 folds</font>, UTG calls $7.50, MP1 folds.

Flop: ($21.75) 7[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $13.5</font>, <font color="#CC3333">UTG raises to $31.9</font>, Hero ??