Start gathering the hard to finds or things u need to shop for now. Last minute u can pack things like pjs and snacks
I think you should start packing when you are around 3 weeks I order to reduce anxiety since it's your first and you have know complications as at now...
I'm due the same day...haven't started packing yet. I would say around 35 weeks. They will try and stop the labor if baby comes before 36weeks so hopefully you won't need it until mid December or later.