Period dates

Patricia
What do you ladies consider your last day of your period? I'm still wiping after the bathroom and it's dark brown blood. (Background: i miscarried out first baby September 4th-had a d and e in 9/11, no period till Friday the 14th, I also had surgery on the 7th for a large dermoid cyst on my ovary. But I got my period finally after 9 weeks, so what do I count as the last day?