1 Clearblue digital BFP 5 days ago. 20+ BFN FRER since.

Lauren
I had a BFP on a Clearblue digital last Thursday. It's been 5 days. Tested like 3 times a day with FRER since. No line. Not even almost. What gives? I don't know when my cycle is due, but it's around now. Has anyone experienced this?