I Am Starting To Experience Post Period Discharge About A

I am starting to experience post period discharge about a week after my cycle has ended. It started a few months ago and is reddish brown to brown in color. I am in my mid twenties and I was told that this could happen as I get older. Other women in my family has experienced this happening to them. I'm wondering if it is age. One month it barely happens then the next there is a bit more discharge. It happens for 2-3 days tops then it is done. I did see a doctor who said it was nothing to worry about. I was even wondering if my use of tampons could have something to do with it as well, or my weight increase.