brown discharge...

I know it can be normal, and that its old blood, but I've had it for 4 days now and I'm wondering if THATS normal. When I saw the nurse she asked me if I had had any spotting and I said no since I hadn't, and literally the next day I started spotting brown. It's gotten heavier in the last 3 days but not a lot heavier. I wouldn't be able to fill a panty liner whatsoever. I mean, it started off as barely anything the first 2 days. I don't have any cramps, I'm just looking for some peace of mind... I don't see her again until the 15th of December. I'm a little over 6 weeks.