December 20th I started my period It ended on the 23rd. I had unprotected sex on the 29th and 31st…

December 20th I started my period It ended on the 23rd. I had unprotected sex on the 29th and 31st of December through past new years 12am. Today is the Friday January 6th I wiped when I peed and noticed light pink bleeding. Is it possible that it could be implantation bleeding? Or something else? Please answer my question someone