What Causes Light Menstrual Bleeding With Clots?

I am 44 and have had 8 children with my husband (might be important to know). I have had regular cycles since I was 11 years old. My last two periods have been normal in length and amount, but consistency is different, almost like watery blood. The last period also went two days longer, but a little lighter on those days. That was unusally. More than that, I have had off and on bloody discharge every day since (a total of 14 days from the start of the period). When its not bloody, its anywhere from pink to brown. It only has odor when its brownish. I even used a doush (probably mispelled) and that did not help. In these days after I normally would have been finished with my period, I even have passed small clots. It just seems really weird. I am generally in good health, a little over weight but eat very healthy. Don t get as much exercise in as I use to, unfortunately. I feel fine and have no pain, my anual exam in July came back normal. I m wondering if its pre-menopause. My sister (48) has had no signs, and my mother can t remember when it happened to her, or what her changes were like (not sure if women tend to do what their mothers did). Thoughts?