I think my group is using AI… what do I do?

As it says in the title, I’m in a group project for one of my classes and I KNOW some of my group members are using AI. It specifically says in the course outline that we are not allowed to use AI at all and I don’t want to get dinged for academic dishonesty.

There is 5 of us in the group and it’s me and one other girl doing everything ourselves while the other group members are second-hand thinking.

I don’t know what to do. I don’t want my name on an assignment that was cheated on…

Do I tell my prof? Please tell me about what you did in a situation like this and what happened. I’m losing over here.