Too late for Implantation Bleeding?

So I’m around 9-11DPO and I have just had a tiny amount of blood on tissue after wiping, sorry TMI. (There was a little more that what’s in the photo but didn’t take a photo of it).

According to my apps I ovulated around 30th Nov/1st Dec but on my BBT chart people are saying I didn’t ovulate until 4th Dec.

Is this IB or early AF? I’m NEVER early though.