Spotting for 3 days..Implanon removed 6th may, af due in 2/3 days

Hello everyone, I had my Implanon taken out on the 6th of May, af came that very day and lasted for 6 days, I took an ovulation test around 16th and 17th and it came back positive, bd a lot in the past 3 weeks, now 13dpo and af is due within the next 2 days or so but glow keeps changing its mind, I have had brown spotting for the past 3 days now on and off, only when I wipe, I am worried it could be a chemical or whether it is just implantation, I've taken tests all came back negative, when do people think I should take another test? I'm not even sure if the effects of my Implanon will affect it :/ I'm just worrying all the time, best of luck to everyone!