TMI question about spotting

Miriam • 38 y/o single mom of 2 little ones ❤️
Ok girls I'm confused about this spotting I've been having for about 5 days now. Glow says my fertile window was 11/29-12/5 with today being 4 dpo..and period is not due until 12/18. What could this be? Only pink when I wipe nothing on panties or liner. Please help any insight is appreciated!