Pink spotting, 2 days bf af is due

This morning I went to the rest room and had vf pink spotting on tp when I wiped. My breast are extremely tender, and I've had mild cramping on and off for about 2 weeks on my right side.

AF isn't due for 2 days according to this app. My last af was 11/26-12/02, glow says ovulation was 12/11... I tested yesterday and got BFN.. 😿 am I out this month is this the beginning of AF? Or could this be implantation bleeding? I should add I never have pink spotting before af or at the beginning of af .. ADVICE please