No bathroom break on last day of class!

Mine was earlier this year. I'm 34 and was in grad school (just got MBA). Well, it was that time of the month and of course, I have a big presentation due on the final day of class. Naturally, my group was one of the last to go. So I'm waiting through other presentations, and I'd used both a tampon and a cloth pad with a liner. I was sitting in the chair and could feel that I was bleeding pretty heavily and could feel the clots coming out. I sort of sat on one of my feet to help "clamp" the flow off. We didn't get a break because most of the people in the class voted to "power through" the presentations since it was the last day of school. When our group's time came, I got up and went to the front of the room. I had the sense to wear black pants, and thank goodness I did. When I stood up, I could feel tons more coming out and couldn't do anything about it. It was awful to stand up there worrying that everyone might see. I finally got through the presentation and sat back down. When the night was over and I got up to leave, I realized that I'd left a huge stain on the cloth chair (it was a recently renovated classroom, too). I just quickly pushed the chair in, put my coat on, and left. To this day, I'm still mortified that there's a chair out there with my stain on it. :(