Implantation or Spotting (6 dpo - 12 dpo)

My period is due in 1-3 days . I have been experiencing pink spotting for 6 days. I also had a Uti during the spotting . According to Glow , Unprotected sex 4 days before Ovulation. Is this bleeding implantation, AF or maybe from UTI? Had Unprotected Sex Jan 2nd and 3 .