Snack every 2 hrs or feel nauseous?

Is there any September mommies that need to eat (snack on something small) every 1 1/2 - 2 hours or they start to feel nauseous. I just started today at 6 weeks. Thankfully I brought plenty of snacks at work , but this is new for me. I don't know if it's the start of morning sickness or just my heartburn acting up since I've suffered from heartburn since high school. Also anyone needing to eat smaller meals at supper or you get an upset tummy?