Bleeding after 3 weeks

So AF was due May 6, which was almost a month ago, I tested when i was 1 & 2 weeks late with first response & both came back negative. Today i started spotting it was like a redish with a hint of brownish color (srry for tmi) it can’t be implantation right? I already have a long cycle as it is 35 days or so. I didn’t have no pregnancy symptoms & i know it’s dumb but there’s no way i could be pregnant right? Also, should i make an appointment with my doctor because of how late i was? I’m 22 so I’m not sure if this could be normal?