Implantation bleeding or period

Pryncess

Pls help me out and tell me what this is pls?

I usually use a tracker but sometimes it don’t be accurate.. it said I was suppose to start Thursday (31st) but as of yesterday I started this and I began googling and this said is could be implantation bleeding …but I downloaded another tracker and it said I wasn’t suppose to start till today(later today) pls help