Implantation bleed??

[notreallytrying]

Hi ladies
I'm on CD 21 and I've woken up to some very light spotting which was slightly pinkish/brown. AF isn't due for at least 8 days according to one app and 14 according to another. I also don't usually experience spotting as a PMS symptom (but also surely this is too early to be PMS). I've also got quite sensitive and sore nipples. Could this be implantation bleeding and anyone have any experience of bleeding like this?

I had the same on cycle day 21, it was really really light and stopped quick and was brownish red. I’m not at the end of my cycle yet but I doubt mine was anything now. Hope it’s different for you!