I Had Unprotected Sex On Dec 3, I Toke The

I had unprotected sex on dec 3, I toke the plan b on dec 4. Had my period a day late on dec 10, it ended on dec 15. Had unprotected sex on dec 17 and toke the plan b on dec 18. I have been having some sort of blood discharge since dec 20 and it's still going on today dec 22. I have been wearing a tampon but it's not as heavy as my period. My period based upon my cycle is due on January 6. What's the bleeding? Will it stop?