100NL Line check with trips

[nogenius]

Party Poker No-Limit Hold'em, $ Hero (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 ($83.50)
MP2 ($19)
MP3 ($114.15)
CO ($100)
Button ($97.50)
SB ($47.65)
Hero ($101.50)
UTG ($260.06)
UTG+1 ($91)
UTG+2 ($137.94)

Preflop: Hero is BB with 9, 3. SB posts a blind of $0.50.
2 folds, UTG+2 calls $1, 2 folds, MP3 calls $1, CO calls $1, 2 folds, Hero checks.

Flop: ($4.50) 3, 5, 3 (4 players)
Hero bets $4, UTG+2 folds, MP3 folds, CO raises to $8, Hero calls $4.

Turn: ($20.50) A (2 players)
Hero bets $15...

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Villian is unknown.

How do you like my line?

[freechus9]

I like check/calling this turn because of our kicker. What is your plan if raised, as well?