2 day period? Could it be late implantation bleeding?

So on Thursday, I woke up to pink/light red on TP. I put a tampon in, “AF is here” which made sense because I was getting BFNs and my temp dropped significantly. After we got home from the EAGLES PARADE, I noticed it was still pretty light and maybe i was just spotting. That night, before we BD, I realized there was more blood (still no clots) but faced that it was probably my period. Wore tampons yesterday, that didn’t fill up and then again over night which wasn’t completely full, but there was definitely blood on it. This morning after my shower i didn’t put a new tampon in bc I forgot and three hours later, still no blood. My period last month was only 3-4 days which is light for me since I got my copper iud out in December but two days???

Does this sound anything like it could be implantation bleeding? It seems late? I got positive opk CD12 night and CD13 morning so I assumed I ovulated CD13. AF showed up on what would be CD28, which is a day early.

My bbt below up until Thursday

bbt this “cycle”

Does anyone have any thoughts?