When is cycle day 1?

Question

My chemical started Monday night with spotting bright pink/red then turned brown until Friday morning the actual flow began. Should I count Monday or Friday as CD1?

Answer

I swear nobody really knows 😑

Answer

I had spotting for 6 days then the clots and cramping began. I counted the first day of clots and cramping as cd1

Answer

I was told any sign of blood spotting included would be cycle  day 1

Answer

My doctor said CD1 would be the first day of actual flow

When is cycle day 1?

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