Implantation bleed or period

H • United Kingdom❤️. TTC1 Long term relationship: Daryl❣.
I'm 17 days early for my period but yesterday I started to bleed but I've had nothing since. It felt like a period I read online that it could be an implantation bleed (which means early stage of pregnancy). Has anyone else had this? Is it normal? And how's tell if it is my period?