Faint line? What’s going on? Please help

Michelle

So I got my period (or so I thought????) on 11/23. I finished my period 5 days later than started spotting dark blood from 12/2- 12/5 and all of a suddenly I started feeling so tired and my boobs hurting when I started spotting. so today I tested out of curiosity and I got this faint positive?

What’s going on!