AF no show, but still negative :-(

Eloise • Kyron Levi, born 21st March 2015 👶💙🍼
AF was meant to show today, but hasn't yet. Tested this morning with FMU but nothing (Internet cheapie test) BFN! Any change still of a BFP? Shouldn't there at least be some kind of faint line?! 
​HELP!! :-(