Bad eating habits

This week, all things healthy make me want to puke. I've been doing so good up until now. I'm 27 weeks and all I've wanted to eat is pizza, burgers, tacos, and processed junk galore for the past week or so. What's a good way to kick cravings? Especially these types of cravings. I indulge sometimes but I don't want it to turn into a habit.