For my pregnancies I had different things that worked, my first I drank ginger beer, like root beer or ginger ale but with a lot more ginger, just a few sips and I went from about to be sick to fine. My second I tried that and it didn't work at all, so I had to keep crackers on me at all times and just snack when I felt it coming on. Also smelling peppermint oil always helps me too