Party Poker 0.15/0.30 Hold'em (10 handed)

Preflop: Hero is CO with , . UTG+2 posts a blind of $0.15. Hero posts a blind of $0.22.
2 folds, UTG+2 (poster) checks, MP1 calls, MP2 calls, 1 fold, Hero (poster) checks, Button calls, SB completes, BB checks.

Flop: (7.46 SB) , , (7 players)
SB checks, BB checks, UTG+2 checks, MP1 checks, MP2 checks, Hero bets, Button calls, SB calls, BB folds, UTG+2 calls, MP1 calls, MP2 calls.

My thought here was that with this many players, I wanted to build the pot in case I made my straight. Should I jave just checked here?

Turn: (6.73 BB) (6 players)
SB checks, UTG+2 bets, MP1 raises, MP2 folds, Hero ???

Ok, I made my straight, but I'm at the wrong end of it. Do I cold-call here?

Ok, after the sudden bet-raise, my spidey-senses went into full alert, and I indeed folded here. Good thing, as both of them had a 7 and split the pot.