Implantation bleeding or period?!

Naomi

I ovulated about 11 days ago, about 5-6 days after I started a light bleeding, first day very light second day a little more blood but took all day to fill pad, I would normally keep changing but wanted to see how much blood it was, on the third day it was spotting, the blood was red first two days then brown third day. My cycle is very regular and I never had any erupts two weeks apart and also my period is 4/5 days and heavy, I am pretty sure this is implantation bleeding but it’s been another 6 days since bleeding stopped and still no positive pregnancy test! Has anyone else experienced this?