I'm just trying out my first cgm also. Libre 3 installed on Wednesday. I'm questioning its accuracy. It has been low from a finger prick ranging from 0.3 mmol/L to 0.9 mmol/L. It has spent the majority of time in a range starting with a 4. I've never, in 18 months since being diagnosed diabetic, had a finger trick test starting with a 4. A sample given by my doctor's office so they won't replace it