I seem to run into these types of situations quite often. What is the best line to take here?

No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $42.95
UTG+1: $99
CO: $120
Button: $99.30
HERO: $119.41
BB: $86.05

Pre-flop: (6 players) HERO is SB with A 4
UTG folds, UTG+1 calls, 2 folds, HERO calls, BB checks.

Flop: 6 2 7 ($1.5, 3 players)
HERO bets $1.5, BB calls, UTG+1 folds.

Turn: 2 ($4.5, 2 players)
HERO bets $3, BB raises to $6