This is not recommended, unfortunately! Raw fish sushi is part of a (very) long list of foods that are best avoided during pregnancy. On the other hand, vegan sushi can be a solution to satisfy your craving (check the list of ingredients to be sure)!
In all honesty, this kind of questioning is likely to follow you throughout your pregnancy. Most people know the classics to avoid like raw eggs, raw fish, raw meat, but the list is much longer.
Our advice: talk to the person doing your pregnancy follow-up, don’t hesitate to search the Internet and do the best you can!
To find out more regarding the foods to prioritize AND avoid during your pregnancy (as well as to know the associated risks), check out this article from Born and Grow.