Implantation bleed or af?

So usually I have a 30 day cycle. Today I'm cd29. But glow changed my af due date to next fridy which would make my usually very regular 30 day cycle actually a 39 day cycle. 
Anyway (tmi) but unjust went to the toilet and when I wiped there was a slight off white colour (almost a light brownish colour) is this the start of a for implantation? I should be like 12dpo which is way to late for implantation right? 

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