Spotting after period ended

I got my period on the 15 this month at like 9pm. i usually get it the 10-12. i ended on the 20. My days usually last 5 days. Right now im having spotting of pink/ brown coming from down there. I know i got my period tho it was heavy. What is the spotting? When i went to use the restroom i saw it on my pad, but when i wiped i didnt have anything and there wasn’t anything in the toilet. Could it just be my period “left overs”? Its cleaning itself down there? please help im worried. Yes i do have sex. But i always use protection. Last time i had sex was Sept. 14. condom was used. i posted this in another group. i can post picture if needed.