So confused

I was supposed to get AF on 10/13. But on 10/8 I started with some spotting. I am having some heavier spotting too. Almost like AF but I haven't had any clotting like I do with every other AF my entire life. So I think this might be AF but could ut be something else? I just don't understand why I have been regular for months and then why this month I would start a week early....if that is what this is. Can anyone shed some light on my issue? Is it just early or maybe what happened?