Question About Late Period, No I'm Not Asking If You Think I'm Pregnant

Mearia

So my question is whether you count the day you were supposed to get your period as 1 day late if it doesn't show. For example, I was supposed to get my period on the 25th (yesterday). I'm typically very regular and almost always start in the morning. So I would count that as 2 days late now at 11p.m. Thursday. Is that right or am I only 1 day late?

Either way, testing in the morning, but still good to know gor future reference.