Period or implantation?

Im 9.5 months pp and yesterday I had a mild bleeding like the one I used to have when my period starts (I havent got my period since pregnancy). I thought it was my period but I didnt bleed anymore🤷🏻‍♀️

I had unprotected sex on December 30-31. And on January 1 I decided to use an ovulation stripe because I had headaches and it was positive, so I was ovulating.

My question is. Is it normal for period to not be regular while breastfeeding?? Or this sound more like implantation bleeding and I might be pregnant?