What could it be?

So 2 days ago i had brown cm with blood in it keep in mind there was still 10 days left for my predicted period to arrive so i was like no biggie af is coming. The next day i went to the restroom to change my pad and when i wiped it went back to very light brown. Today again i went to the restroom now my cm is clear what could’ve it been? 🤔 according to app im 9dpo