Yes the risk is very, very low. But there has been listeria found in the past in pre packaged deli meats in the past.

Listeria doesn't only effect you in the first trimester, if you get it there is a huge risk (from memory about a 50% chance) of miscarriage or still birth whatever stage of pregnancy.

At the first app with my ob, he gives you a talk about listeria and the hospital also mail a pamphlet to everyone.

I'm not meaning to freak you out, just putting the facts out there.

Having said all of that, I have had foods I shouldn't. Sushi, food court food. Yes the risk of getting listeria is very very low, it's just bad if you happen to get it. I knew the risk and decided to eat what I did anyway.

If it was me, I'd be presuming it was fine but probably wouldn't eat it again. (unless you cook it)