When is CD1?

[Monelli]

I know this sounds a daft question but on occasion I have had very light spotting one or two days before AF started in full flow. Do I go with the spotting day or when it starts properly.
Thanks

 

[Dawn2411]

I would go with when a/f hits full on. Good luck and baby dust to you

 

[crystal443]

Its first day of full flow