5+0.5 Low TPTK on flop gets raised

[MadMike]

Push, call and go all in on turn non-heart, or fold and wait for another time here?

1 limper comes in, reasonably tight preflop. No great read postflop. I have "will come overtop of continuation bet" as note- but that is from 2 hands that wern't shown down and my bet wasn't a continuation here.

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) CP hand converter

Hero (t1327)
UTG (t2435)
MP (t1370)
CO (t3415)
Button (t2558)
SB (t2395)

Preflop: Hero is BB with 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, CO calls t100, <font color="#666666">2 folds</font>, Hero checks.

Flop: (t250) 5[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t200</font>, <font color="#CC3333">CO raises to t600</font>, <font color="#CC3333">Hero ??? </font>

The 3 things I was thinking of at this point were:

My stack is getting short, a laydown here puts me closer to the red zone.

Lots of draws on the board. Semibluffing possibility abounds- 2 overs and a FD may have a higher win% than I do here- although a laydown would be wrong given the odds I'm getting.

2-pair is unlikely. Villian it playing too few hands to be limping trash.