I'm just gonna give an example because I don't really know how to ask it. So let's say your period is supposed to start October 3rd but it's now October 5th, so are you now 2 days late? Or do you have to wait til what's supposed to be the end of your period. So if you're suppose to start Oct 3rd-7th but you still have no period on the 9th, are you 2 days late?? Or a week late?? Does this make any sense?? Lol. This is what I think about at 3am in the morning when I can't sleep lol. NOTE this example has nothing to do with me. I was just giving a scenario so I could explain it better and ask it better.