Implantation bleeding or period?

Kami

Last night I had very light pink spotting (small amount) and I thought it was my period maybe starting so I put a tampon in before I went to bed and when I woke up and took it out this is what was on it. I’ve never had this happen before with a period so I’m just curious if this is implantation bleeding or my period starting? I wiped some of it on toilet paper and it was like a brown color.