First Time Playing Triple Draw

[ActionDavidK]

Thanks for responding.

Triple Draw 2-7 Lowball Limit ($0.50/$1) (converter)

SB ($22.60), Seat 6
Hero ($92.50), Seat 1
UTG ($47.85), Seat 2
CO ($25.60), Seat 3
Button ($16.50), Seat 4

Button at Seat 4.
SB posts $0.25. Hero posts $0.50.

Hand: [5d 3s Ah 7s Th]

Round 1: (1.50 SB)

<font color="#666666">UTG folds. </font><font color="#666666">CO folds. </font><font color="#666666">Button folds. </font><font color="red">SB raises. </font><font color="green">Hero calls. </font>
SB takes 1. Hero discards Ah Th.

Hand: [5d 3s 7s 6d Qd]

Round 2: (4.00 SB)

<font color="red">SB bets. </font><font color="green">Hero calls. </font>
SB takes 1. Hero discards Qd.

Hand: [5d 3s 7s 6d 9s]

Round 3: (3.00 BB)

<font color="red">SB bets. </font><font color="green">Hero calls. </font>
SB stands pat. Hero stands pat.

Hand: [5d 3s 7s 6d 9s]

Round 4: (5.00 BB)

<font color="red">SB bets. </font><font color="green">Hero calls. </font>

Total pot: (7.00 BB - $7)

Should I have reraised with position before the first draw?
After the 2nd draw should I have raised?
Should I have drawn after he stood pat?