Is brown blood counted as period

Katie
So I get 2-3 days heavy-medium red blood as normal then 3-6 days brown spotting ? Of course it's old blood but do I count those days till it stops completely? I ovulate around day 15 - 16 I believe but still havnt fell pregnant 😕 that's why I'm asking because maybe I'm calculating it wrong ? 
Someone help 😫

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