100NL, nitty fold with second nuts?

villain is unknown. Its a limped pot and i had second nuts facing a 3 bet on the turn. Can we make a nitty fold and move on or just fucking shove or flat call?
No-Limit Hold'em, $1.00 BB (7 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

Hero (BB) ($100)
UTG ($20)
MP1 ($40.80)
MP2 ($36)
CO ($99)
Button ($163.50)
SB ($99)

Preflop: Hero is BB with 5, J
UTG calls $1, 3 folds, Button calls $1, SB calls $0.50, Hero checks

Flop: ($4) K, Q, A (4 players)
SB checks, Hero checks, UTG bets $2, Button calls $2, SB calls $2, Hero calls $2

Turn: ($12) 8 (4 players)
SB bets $5, Hero raises $17.50, 1 fold, Button raises $30, 1 fold, Hero ?

lol at folding, definite shove.

Shove over

shove

i think it's close betwen calling and calling again and shoving. Both should be +EV though.