yes, that is what my Dr also said, day 1 is the first day when you get full flow...not spotting
spotting doesn't count. It's your first day of an actual flow. :)
I tend to ignore light spotting, especially if it comes in the evening, and just start the count the next day. If I were to begin spotting at 1 am and spot all through that upcoming day and night, I might count that as a Day 1.
I think the first FULL day of your period is your 1st cycle day. That's what my doctor told me anyways. :) Hope this helps. :D