A4 in bb after sb open-raises pf

[Wynton]

I'm quite confused what the proper play should have been here. This was my first hand at the table, which made it much harder.

Party Poker 5/10 Hold'em (6 max, 6 handed) pokerhand.org hand converter

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">SB raises</font>, Hero calls.

Flop: (4 SB) J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Turn: (3 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, SB calls.

River: (7 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Final Pot: 9 BB