Pocket 2s fang pre-flop 3-bet

[theblitz]

Situations like this come up often.
Is this callable or not?

Tain
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $55.94
UTG+1: $48.75
Hero: $72.50
Button: $45.00
SB: $83.30
BB: $57.25

Pre-flop: (6 players) Hero is CO with 2[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/heart.gif[/img]
UTG folds, UTG+1 calls, Hero calls, Button folds, <font color="#cc0000">SB raises to $2</font>, <font color="#cc0000">BB raises to $4.5</font>, UTG+1 folds, Hero ?

I am playing BB on 2 separate tables and he seems a solid player - not doing anything stupid. However, this small raise looks weird.
Nothing on SB.
Also, I am scared that it will be raised again by SB.

So, fold or call and fold if SB raises again?