Implantation bleeding or period

So several hours ago I thought what was my period didn't last very long. Well it's very light pink and I don't even feel it coming out. I'm having slight cramps nothing to scream about. My last time having sex was June 2nd and LMP was May 9th. Maybe I ovulated later than usual and experiencing implantation bleeding or it's the start of my period. My test yesterday was negative and it's barely noticeable