False Negatives?

I am about 2 weeks late, (CD42), with NO sign of dear aunt flow. I tested last Sunday and got a BFN. I don't have any "symptoms" but frequent urination and itchy breasts. Have you received a false negative?

I uses the Clearblue Plus pregnancy tests at the night as well as first thing the next morning.

How far were you when you got your BFP?