4 days late.

Dayna

At 7 DPO I went to the restroom and when I wiped there was a streak of blood on the toilet paper. Wore a panty liner thinking AF was coming early but when I went to the restroom again there was nothing there. Also at 11 DPO the same thing just it was lighter than day 7. Now my period is 4 days late the only symptoms I’ve had is light cramping and I’m only spotting when I wipe no blood on liner. What could this mean?