Cycle day 31 no AF and BFN Helpp

Rachel
Hi all
I am on cycle day 31, 3 days before AF and I've been having cramps on and off for the past 5 days! I've tested 5 (yes5) times, had what I thought was a faint positive twice (with blue dye), although these could be Evaps,  followed by a BFN with FRER (picsbelow).
I've had a little spotting today, more like bloody mucous rather than a period but I've had strong cramps. I thought AF may have arrived but nothing yet! 
I had a really early miscarriage last month at 5wks 3days, so glow is calculating my cycle longer than norl. My cycle is usually 30-32 days so I would have expected her by now especially with the cramps.
Has anyone ever experienced this? Could I have ovulated late? Am I being optimistic? Or is my body still recovering? Have I potentially had another chemical? Eurgh help  xx