I'm 12 dpo and I have been cramping today a bit and when I wiped a few hours ago there was a small…

I'm 12 dpo and I have been cramping today a bit and when I wiped a few hours ago there was a small amount of pink blood on the tp. I went to the bathroom again about an hour later and there was an even smaller amount of pinkish/brownish blood on the tp. That was several hours ago and the cramping and spotting have both stopped. Do you think this is the start of af or is it at all possible to be implation bleeding? Here is my chart fyi. I have been insanely irritable and frustrated the past few days. Praying the witch stays away, but I'm worried I might be out this month. Anyone have any thoughts?