I had a normal period about two weeks ago and then about 3 days ago, I started spotting brown blood. The spotting is very light (which is very unusual for me), and a little smelly. I'm 39 years old and have a history of Non-Hodgkin's Lymphoma and had chemotherapy almost 3 years ago. My periods came back a few months after I finished chemo and for the most part have been pretty normal except for a couple of months where I would have two in a month. I've read that spotting brown blood right before starting your period is normal and is just expelling old blood, but is it still normal mid month? Is three days of brown blood too long?