Herbal tea (chamomile) can be consumed during pregnancy but requires caution. Generally safe in moderation, but not well-studied. The key guidance from ACOG: Limit to 1 cup per day.
A "Use Caution" rating means this food is generally fine during pregnancy but comes with a specific factor worth managing — a daily limit, a preparation requirement, or a moderation guideline — rather than a reason to avoid it outright. These ratings reflect general guidance from the FDA, ACOG, CDC, and USDA. The goal of the "caution" label is to flag what to pay attention to, not to suggest the food is unsafe when that factor is properly managed.