13 DPO implantation bleeding? Tmi (no picture)

Af is due tomorrow (according to glow). I have long cycles. I am on CD 31 and 13 DPO. Tonight I had some blood when I wiped. It was super light pink in color along with ewcm. Is it possible to have imantation bleeding this close to af? I took a test this morning and it was a BFN
Thanks in advance for your responses :)