Has anyone had a false negative from a Clearblue Digital?

[completelybaffled]

My cycle is always exactly the same number of days but I am now 3 days late, and we are TTC, so I did 2 of those Clearblue Digital tests, and they were both negative. I know that my period might just be late, but I haven't been ill or very sytressed, and it is a bit odd for me.

Has anyone had false negatives from the CND tests?

i need some advice cos ive done 1 clearblue digital 3 weeks after conceiving but came back negative. What confused me the most was the fact i have most symptoms and my pregnant mate pointed them out as she had the same before she found she was 4 weeks gone. Someone please help