I know this is off subject but I’m new to this & looking for answers

Has anyone had experience with implantation bleeding? I was 12 DPO when I started lightly bleeding so I instantly thought okay AF is here. That night I went to the bathroom and it wasn’t just blood it was raw egg white CM a lot of it with blood in it, but I didn’t think anything of it. Then the bleeding got a little heavier not much and it was dark. I took a test and I think I see a faint line. Anyone ever had this? Or has any insight?