Kinda freaking out— maybe implantation bleeding?

AF is due 12/10 — I have no idea how many dpo I am... maybe 9/10 or 10/11 — just had a small amount of brown blood though when I wiped. Like old blood. Never had this issue of spot bleeding or brown bleeding before a period before. Could it be implantation bleeding? Trying not to freak out but definitely freaking out (in a good way of course)