3 BFP's Then a BFN before AF????

Yvette
Ok Ladies I need help! So I tested on 10dpo and got a faint positive, I also tested on 11,12 with progressing lines( positives) and today on 13 dpo a day before AF is due I got a BFN with frer!!! I'm super bummed has this happened to anyone and still got their BFP?!?!?