I am 43 years old, and I am experiencing a 2 1/2 week period. I am on day 18. My period started out normal, but it just continues to be light spotting. I have never experienced this in the past. I am also on a Merina IUD, but I get a period every month that is light, but lasts about 7 days. In addition, about 3 - 4 months ago, I had an ultrasound and the doctor found a cyst the size of a grapefruit on my uterus. I was quite concerned, but she was not that concerned and said that this was normal for my age and that hormones produce this cyst monthly. Should I be concerned?