[2NL] 99 ( Flop a Set )

Not many stats to go on here. The BB had only played 12 hands, but on the hand before had lost around $2.30 calling somebodies all-in on the River when the opponent had flopped a FH.

UTG was limping every time he played, he limped with AA & KK, he was 31/1 through 150 hands

PokerStars No-Limit Hold'em, $0.02 BB (5 handed) - PokerStars Converter Tool from FlopTurnRiver.com

Hero (MP) ($2.60)
Button ($3.14)
SB ($1.42)
BB ($3.37)
UTG ($5.54)

Preflop: Hero is MP with 9, 9
UTG calls $0.02, Hero bets $0.08, 2 folds, BB calls $0.06, UTG calls $0.06

Flop: ($0.25) 5, 9, 7 (3 players)
BB bets $0.18, 1 fold, Hero calls $0.18

Turn: ($0.61) 4 (2 players)
BB bets $0.44, Hero ???

I am not even sure what I am doing here? Should I be raising to protect against any straight draws? It would seem stupid he called a 0.08 raise on say 86s & then donk bets the flop, which makes me think he probably has an overpair?

Should I just shove here and get it all in or call again and shove on the River?