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


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.