I got a positive pregnancy test this afternoon but I had light bleeding this morning & it started off super light pink but way more brown

Now it seems dark red & lots of brown. Not super heavy.. but I’m just super confused. I’m 9dpo. About 6 days away from expected period.

I took a pregnancy test this morning with fmu & it was negative then I took one this afternoon & it was positive.. took one 5 hours later and it was negative (I think I can see the faintest line, not sure)

I have no cramps at all. I’m also 8 weeks postpartum.

Chemical? Should I call my doctor? Did anyone have bleeding & it turn out fine?