Implantation Bleeding or AF?

Dianna

This has been a relatively long luteal phase (for me) since I usually never go past 8DPO before I get my period. I am on DPO 9, and earlier today I got a tiny little speck of something in my tissue and now just now I had this. No additional blood. Do you guys think it may be IB? That would definitely explain way HPT yesterday was negative. Or do you think it is AF?

I thought my CM was drying up but now it seems to be rather runny again...