I'm pretty casual about those things, so I'd say you'll be fine. I remember reading/hearing somewhere that you've more chance of getting hit by a car than getting listeria? Don't know how true that is - it might depend on your lifestyle, how you store things in the fridge, where you buy your food, ethnicity etc. It's just that listeria can be pretty bad news for a pregnancy so it's worth keeping in mind and paying attention to food hygiene.

I imagine you wouldn't miss it if you had listeria? Food poisoning tends to be pretty dramatic doesn't it, with its cramps and stuff?