Decreasing hcg

My hcg started decreasing a week ago, levels from yesterday are still pending but I feel they have gone down. How long after your levels decreased did you start bleeding? I should be 6 weeks but it looks as if nothing ever really progressed that far, my levels only went up to 442 and that was over a week ago now, I still haven’t had any bleeding at all, ultrasound never showed anything either. anyone ever had anything similar? When did you start bleeding? How long for hcg to go back to zero?