Ive had huge sushi cravings this pregnancy too! Ive heard that its not only the raw seafood, but also the rice that can contain harmful Listeria as it has been cooked and then cooled down. I think if you want sushi so bad, do what i do and go to a sushi train restaurant where they are made fresh right in front of you rather than a take away place
That has got to be better than the premade ones sitting in the window, but I'm still too paranoid for that. They still cook the rice well in advance and leave it sitting there cold. At least when you do it at home you know you made the rice fresh...