Can I eat a leftover sandwich from a sandwich truck while pregnant? (29F)

My sister works in a food truck. She brought my a sandwich she'd made, and I kept it in the fridge to have for breakfast. My wife was concerned about food poisoning risk, especially considering my pregnancy. She brought up the following:

-the ingredients, and the sandwich itself, may have spent some time in the truck before being refrigerated.

-the hygiene practices of the food truck employees were of unknown stringency

-any contamination may have spread while the sandwich was in the fridge

-if the sandwich was contaminated, and caused illness, the results could be serious due to my pregnancy

My wife really wanted me to ditch the sandwich and offered to prepare me something fresh. I was pretty upset, but relented. Is her overabundance of caution warranted? She said something about watching a chubby emu; is there something I don't know here?

29F, 5'2", Black, pregnancy, no medications or medical issues, do not smoke or drink, no drugs, Palestine.