Implantation… or the weirdest spotting I’ve ever had

Rebecca

Ok I have had brown spotting off and on for 4 days now I took a test Wednesday it was negative I took one today and I see a faint line spotting is completely gone my boobs are killing me and so sore and I’m extremely tired. I do have endometriosis and it’s hard to track my cycles but I always have sever bad period and bleed a lot never had this before what are y’all’s thoughts.