A turkey sandwich is safe during pregnancy IF the deli turkey is heated to steaming (165°F) first. Cold deli turkey carries Listeria risk. A toasted sub or panini where the meat gets hot is a good option.
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.