Ditto what the others have said!
I knew early on, and I was still anxious, but then I'm a born worrier!

In regards to the listeria, I'm pretty certain that you can tell if you've got it, I think its flu-like sypmtoms and it would be around the time that you ate the food that you'd feel sick. Hopefully someone with more of an idea comes on and helps you out.

Congratulations!