SH NL50 A2s bottom pair

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.25/$0.5 No-Limit Hold'em (5 handed)

Known players:
[tg]CO (Hero)$90.87:///////;BU$53.83:///////;SB$20.18:///////;BB$20.00:///////;MP3$70.83:///////;[/tg]

Preflop: Hero is CO with 2:h, A:h.
MP3 folds, Hero raises to $1.25, BU calls $1.25, 2 folds, BB folds.

Flop: ($3.25) 3:s, 2:s, 7:d (2 players)
Hero bets $2.00, BU calls $2.00.

Turn: ($7.25) 5:c (2 players)
Hero checks, BU bets $5.00, Hero calls $5.00.

River: ($17.25) 5:d (2 players)
Hero checks, BU bets $14.00, Hero ???.

BU 14/12 100hands

pre: ok

Flop: what should be my plan for the hand?

ingame: hit--->auto-CBet...lost at Turn

I can b/f Flop and turn my hand into a bluff (or valuehand with A or 2) on good Turns or give it up otherwise...would that be ok?

as played: Fold Turn>Fold River>Calldown?!