Stupid question about CD 1

Th

I don’t know why I can’t just get to the bottom of this but I’m seeing so many conflicting responses. I’m about to start letrozole and do not want to mess this up! This is like a “chicken or egg” question to me.

Here it goes...

Does cycle day 1 begin with consistent spotting or with bleeding?

Today I’ve been cramping a lot and spotting a bit but no true blood yet. Is this CD1?

Thanks in advance! 😘