If I'm traveling in the opposite direction of a stopped school bus on a road with a median and there's a child that has walked across the median to get on the bus on the other side, do I still have to stop until the lights go out or can I proceed with caution once it's safe to do so?

I got lost while out of town and had to perform a U turn but didn't see the car coming up behind me and pulled out in front of them causing an accident.

It was in a 50 km/h zone, clear visibility in both directions and I was stopped on the shoulder prior to starting the turn. It's pretty cut and dry against me but I obviously don't want to be stuck with a careless driving charge.

I'm going to set up a phone call with a prosecutor first to hopefully get it resolved without having to go to court but was wondering what kind of charge reduction to expect in this case.