Are you supposed to feel burning and nauseousness in your abdomen when you're pregnant?

Possible: It is possible. Pregnancy does cause nausea often referred to as morning sickness. This can have varying degrees of intensity and timing. However, usually gets better as more time progresses into the pregnancy and esp by the 3rd trimester. Pregnancy can also increase chances of reflux which may be the burning sensation you are experiencing. See you md for more information and clarification.