What is this?

So this isn’t normal period blood. Or it isn’t normal for me anyway but I did think I was on my period! I took a test Friday that came back with a visible clear faint line then 1/2 hours later my period came. It was red when I wiped, but nothing on pad so I put a tampon in and wore for about 5 hours then took it out and wasn’t covered completely like it usually is on first day of period and it was brown not red. I bled like this for 3 days (not heavy at all!) and it’s almost at a Stop now but with this pinky looking discharge. What is going on?! It’s not a miscarriage as I’ve experienced this before and I’m sure it’s not a chemical pregnancy as it’s way to light for that! I’ve read up on breakthrough bleeds that happen when your period is due (my period was due Sunday but came Friday) This is a VERY unusual period for me. Tbanks