Implantation bleeding or period coming?

Ja

Today is 12 dpo and 2 days before my expected period. Last friday (oct 19) I bought a pregnancy test after feeling I may be pregnant. It came back positive, 1-2 weeks pregnant (clear blue digital test). Now today, I woke up this morning and went to bathroom and there was a small amount of brownish blood. This blood also appeared when I used the bathroom the 2nd time today. Can anyone tell me if they experienced the same / similar thing? Does this mean I am having implantation bleeding or a miscarriage. Please let me know your thoughts. Thanks for the support.