Spotting mid cycle

Jessica

Hey ladies, my last period was on August 6th and exactly on the 21st I started spotting brown as seen in the pics was never enough to even get on my panty liner so a few days pass still spotting brown and yesterday being the 4th day spotting brown I saw dark red also seen in the pics. Today I’m still spotting this dark red and I’m so clueless as to what it could be. The bleeding is not heavy like period bleeding..I had a few pinching down in my lower stomach but nothing that feels like period cramps, boobs are starting to feel heavier/tingling and my lower back is also aching but it has been aching for the past 2 months. Any ideas on what this could be??