I am 51 years old. I have always had regular periods - every 28 days. Now, 2 weeks after my last period, I have started bleeding again. I use a menstral cup - and normally, I empty it twice a day and it is about half full each time. This period, I empty the cup about every hour and it is full. The blood is very bright red and thin, when normally it is dark and thick. Should I be concerned? Go to emerg?