A.S.
I was extra sensitive to bacteria in food when I was pg with my daughter. I got 4 different types of food poisoning while pg with her. The only time I got really concerned (until I found out that the people I went to lunch with the day before had the same issue) was when I was vomiting and had acid reflux so bad that my throat bled.
I kept Mylanta (the original) by me at all times. One on my night stand, one at work at my desk, and one in my car.
If you're not vomiting or having diarrea, there's not anything to worry too much about. If you are, you have to worry about dehydration.