How should I have played this?

[Helios]

Party Poker Pot-Limit Hold'em, $ BB (9 handed) converter

BB ($25)
UTG ($86.83)
UTG+1 ($31.95)
MP1 ($9.9)
MP2 ($40.9)
MP3 ($20.3)
CO ($22.9)
Button ($84.75)
Hero ($23)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $0.25.
UTG calls $0.50, UTG+1 folds, MP1 folds, MP2 calls $0.50, MP3 folds, CO folds, <font color="#CC3333">Button raises to $2.75</font>, Hero (poster) calls $2.50, BB folds, UTG folds, MP2 folds.

Flop: ($7) J[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1.5</font>, <font color="#CC3333">Button raises to $3</font>, Hero calls $1.50.

Turn: ($13) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $5</font>, Hero folds.

Final Pot: $18

I had just sat down and had no reads.