Two Hands- did I make the wrong move

[B Dids]

Hand 1

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (5 handed)

Dids (t425)
SB (t2140)
BB (t2755)
UTG (t1250)
MP (t1430)

Preflop: Dids is Button with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img].
UTG calls t100, <font color="CC3333">MP raises to t400</font>, Dids folds, SB folds, BB folds, UTG calls t300.

Hand 2

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (4 handed)

Dids (t425)
UTG (t2090)
Button (t2755)
SB (t2730)

Preflop: Dids is BB with 5[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/club.gif[/img].
UTG folds, Button calls t100, SB completes, Dids checks.

Flop: (t300) T[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
SB checks, Dids checks, Button checks.

Turn: (t300) 5[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">SB bets t100</font>, Dids folds, Button calls t100.

I'm so short stacked that I wanted to push in- especially with the 7s, but with that pre-flop raise I didn't want to move with against a better pair.