Morning sickness or food poisoning?

I am 10 weeks pregnant I have had nausea in beginning of my pregnancy but it had subsided about a week ago. Last night I started to feel sick after I ate dinner. We picked subs from a chain place (firehouse subs),and since then my stomach started to hurt. All day today I have very nausea, stomach aches- little painful. I threw up a little and now I feel like I have chills. No real temperature just a little warm. I am sacred of listeria cause they warn you about that with pregnancy. My sandwich was a turkey/ham combo with Mayo etc. They "steam them" but by the time I got home it was warm. It tasted good but now I'm sacred. It is Saturday so I can't see doctor until Monday. I can sip on water, gingerale and eat saltines. Tea make me ill. I have a constant ache in my stomach and don't want to move. I know your uterus starts expanding but I I just don't know what it could be.