First day of cycle?

Jaimee
So I need to know when CD1 is because I'm taking letrozole this cycle starting on day 3. And I'm unsure if my first day of my cycle is when spotting started. Or if it's when the heavier flow actually starts. 
My doctor office is unfortunately closed and won't be open until tomorrow. :/ so am curious if you wonderful ladies could enlighten me? 

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