Implatation or period?

My bunny and I had unprotected sex last week. My period is to start oct 30. Today while using the bathroom, a pinky spot fall from my vagina into the toilet. I wipe again and notice the pick discharge. I'm wondering if this is an implantation or my period starting a week earlier?

This is just something I copy off "https://americanpregnancy.org/getting-pregnant/what-is-implantation-bleeding/"

Typically, it begins around a few days before the next menstruation cycle. However, as implantation bleeding occurs at a similar time to that of a period, many women are confused whether it is a possible pregnancy or a period."

I'm tired buying pregnancy test for a negative result. Which can it be 😑