HELP ME!! FREAKING OUT!!

Hi, so I need some advice. I'm a first time mom to be and I'm five weeks, four days pregnant I'm the anxious type trying to do everything right... been reading books and have all types of pregnancy apps.. I read that deli meat should be avoided because it can have listeria and cause miscarriage. I had a turkey and ham sub from the cafeteria at my job for dinner and didn't even think about it until I already ate it!!! Please help me.. will my baby be ok? I need advice. :(