5 days early or IB?

I ovulated on the 9th of oct, which just so happened to be my wedding anniversary so as you can imagine lots of BDing.

I noticed a bleed last night and if it's AF I'm 5 days early but is it possibly implantation bleeding? Slight cramping too. Doesn't seem too heavy just there when I wipe (tmi sorry, it's also red and brown, sorry)

Any ideas??

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