What day would you consider as the first day of my cycle?

Amy
Hi all! So I had brown spotting with a little bit of red 12/7-12/9, not even enough to use a tampon, just a liner. Today 12/10 however no more brown spotting just red but a light flow. What do you think would be considered as the first day of my cycle, so I can try to predict when my fertile window is. 

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