Spotting

Hi ladies! Just wanna share and ask, I had my period on Dec 2 and lasted until Dec 8. But today, (TMI) I noticed a brownish stain on my pantyliner and when I wiped there's a somewhat pinkish-reddish stain. Last contact was almost three weeks ago.

I haven't experienced this before. Maybe I was just overthinking. Hmm, whatt are your thoughts?