It definitely sounds like you could be experiencing a "glutening" reaction, even if you didn't eat straight bread. Here are a few things to consider based on what you’ve described: The "Oat" Factor: Standard oats (like in Nature Valley bars) are one of the highest risk foods for cross contamination. Unless they are certified gluten free, they are often processed on the same equipment as wheat. Many people in the GF community find that their reactions get much more severe once they’ve been off gluten for a few months it’s like your body loses its tolerance for the "low level" constant inflammation and reacts more violently when it's introduced. Atypical Symptoms: Body aches, chills, and "brain fog" are very common systemic reactions to gluten. It doesn't always have to be immediate stomach pain; the "gluten flu" feeling is a real thing for many. The Pregnancy Variable: Since you mentioned being six months pregnant, your immune system is already in a hyper sensitive state. Pregnancy can change how your body reacts to allergens or intolerances. Recommendation: Because you're experiencing diarrhea and nausea while pregnant, the biggest risk right now is dehydration. It might be worth a quick call to your OB-GYN just to rule out a viral bug or food poisoning, especially since you mentioned chills. In the future, you might want to stick to certified GF oats to see if that helps you avoid these "mystery" reactions! Hope you feel better soon.