Implantation bleeding or early period

My periods was October 18 to the 21st and according to my clue period tracking app i would ovulate between 30th until the 6th of October my boyfriend and i had sex on the 30th, 1st, & 2nd & since November 15 ive notice brown spotting in my underwear but i seem to only spot once a day my period was supposed to start today but ive still only got the spotting could this by chance be implantation bleeding or just a light period the picture shows what it’s looked like since the 15!