My question involves a traffic ticket from the state of: Minnesota

I have not received an official ticket yet but I was driving down the road next to a bus, it was slowing down when I was in my truck already past the red stop sign in my passenger mirror it was out but not until then. I kept going but know I think that is considered careless driving and wonder what will happen. I was not on my cell phone or distracted other then what I was saying to my self.