I had a period on October 1st which was normal with cramps and lasted 7 days. On the 20th I went to the restroom and had brown blood. I had no cramps, nipple pain, or moodiness. I usually have a 30 day cycle. Over the past 9 days it has gone to dark red in color but no clots or pain. The flow is medium to light. I usually always have clots and cramps. I've never had a period last this long. Any ideas what is going on? I am not on birth control, never have been. I am 22 years old.