Can someone help please? Spotting for two days

Zoe

Would appreciate any help. My period was due 3 days ago. Yesterday and the day before I have been spot bleeding. Nothing at all in my underwear only little bits of blood when wiping. It’s been slightly brown and pink. Today it has stopped. Usually get very heavy af. I don’t think it’s implantation bleeding as it came when af was due was expecting it to get heavier but just stopped. Y could this be?