I got a positive Clear blue digi the day before AF was due - then a negative first response a day later!! I was gutted so did another Clear blue & got a positive!
Clear blue digi's are by far the best in my opinion xx
When i got my bfp cheapies showed nothing, normal clearblue had the faintest line (i was holding it up to light at window etc)... but digi showed my bfp 9dpo!