I’m confused

Brianna

So, I got a positive test Saturday and was excited because I assumed I was pregnant. My period was expected that day as well but never came. Today (3 days after my missed period) I started bleeding but it’s lighter than my normal period is. It’s light pink and kind of red but it’s very light and it only shows up when I wipe. Barely even a drop on my pad after hours of bleeding. Is this implantation? Is this my period? Is this a chemical pregnancy? I’m so confused.