Listeria?!

Okay, so I am freaking out just a bit. On Tuesday I had a lunch meat sandwich with smoked turkey and salami, since the turkey was smoked I figured that was fine, but I had them heat up the salami for me. I felt fine all day, but Wednesday morning when I woke up on my way to work I vomited, I'm 12 weeks and have never gotten sick. I also didn't eat breakfast that day and only had water and my prenatal vitamins. I didn't think anything of listeria until I started reading about the symptoms. Do you think I'm over reacting and the sickness was from not eating or could it actually be harmful to my baby! I go Tuesday for our 12 week screen! Any answer is helpful!!