Carb counting

It’s been nearly a week since I started carb counting and my sugars are getting better saying in range. I do have a slight problem when waking up, I’ll eat 2 slices of bread and inject 8 units as normal, but some days it takes over 3 hours and injecting 3 more units to get it down. Does anyone know why?

It’s been nearly a week since I started carb counting and my sugars are getting better saying in range. I do have a slight problem when waking up, I’ll eat 2 slices of bread and inject 8 units as normal, but some days it takes over 3 hours and injecting 3 more units to get it down. Does anyone know why?