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 because it’s way too 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