Macaroni salad. Will baby be ok?

34 weeks and went out to get something to eat. I ordered some food with macaroni from this place I like to go to. Normally I avoid the macaroni salad because of listeria. But today I wasn't thinking. They packed it up with the hit soup like they always do. I drove home and ate about 4 bites before I realized I probably shouldn't do that! It was more warm that cold. And being a Japanese eatery, I don't know how they prepare. I feel so dumb and worried.