I am 17 years old and I got on Depo-Provera around three months ago. I am just about ready to get my next shot real soon. However, my concern is that I've had spotting twice within these three months. The first time lasted precisely two weeks. Very little spotting but the substance did not look like blood at all. It was more like thick and brown. Now, that has started again just about a week ago. I thought it was a light period, but it doesn't look like blood. The color and how thick it is only throws me off. Any idea what this might mean/be?