50NL TPTK facing push

I hate when I commit too many chips with TPTK it puts me in awkward situations like this. Do you call this push?

Just sat down so no reads.

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

CO ($37.85)
Button ($40.53)
Hero ($51.75)
BB ($125.98)
UTG ($29.49)
MP ($76.13)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $0.25.
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $2.5</font>, Button calls $2.50, Hero (poster) calls $2.25, <font color="#666666">1 fold</font>.

Flop: ($8) 7[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $7</font>, CO calls $7, Button folds.

Turn: ($22) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)

Hero bets $15, CO pushes for $13 more</font>

Final Pot: $22