Listeria, anyone experience it?

Jennifer
I have completely avoided subway and port of subs for the last 7 weeks due to being pregnant. My husband wanted to go today so I looked up what was safe there and decided on getting a meatball sandwich. 
My husband did not know that I couldn't have deli meat and of course while we are there, a pregnant women walks in. Orders a sandwich with 3 different meats, sits down, eats it in front of us. Now my husband thinks I'm crazy! My coworker also ate deli meat sandwiches every single day while she was pregnant (way before I was pregnant) because she had no idea she was not supposed to avoid it, her doctor never advised her. 
I guess I'm wondering if the risk of deli meat and certain cheeses is "really" that high? I know that any risk is not worth it, but it just blows my mind now I have seen and known multiple pregnant women who eat deli meat on a daily basis.