Spotting for 7 days before period!?

Spotting started 7 days ago as light pink when I wipe then a little on my liner, changed over the days to darker brown/red. My period isn’t due for another 3 days. I’m usually like clockwork however my last period only lasted for 3 days.

Ovulation was on Sunday 12th, Intimate on Monday 13th, Spotting started on Thursday 16th and my period isn’t due till Saturday 25th. Experiencing mild cramping and fatigue. I’ve never had any spotting before a period before.

We’re not TTC but we’re also not, not TTC.

Implantation bleeding or period spotting? Dr Google is making me crazy!