Implantation bleeding ??

I haven’t gotten a positive from the doctor yet . And I’ve had 4 positive line tests and 1 positive digital test . Is this implantation bleeding or should I be worried ? The line tests you Can’t see it in the top 2 but the bottom ones you can . This started last night on an off , started super light pink I almost didn’t see it , then it went to this brownish color . My missed period would have started yesterday . If I did my stuff correctly i would only be between 3 and 4 weeks