AF started at 4:30pm Saturday. When should I consider CD1 as I have to start Clomid on CD3?

Elizabeth • 27🌼Happily married❤

Full-on AF started Saturday at 4:30pm so should that be considered CD1 or Sunday as that's the first full day of AF? This is my first cycle on Clomid and I was instructed to start on CD3

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