14dpo implantation bleeding?

Hi girls - I am 14dpo today and haven’t had a BFP, but I’ve had the oddest luteal phase I’ve ever had, with some heavy cramping on 12dpo. I’ve never had cramping that far pre-AF before! Earlier today, I had some reddish brown spotting and thought AF was here, as I am due today, but there has been nothing since. Is it possible to have implantation bleeding this late, or is this just a really whacky cycle????