[Lelola]

Everything expires in the medical world. Even something as simple as a white 2x2 expires or an alcohol prep. Officially, you should go buy another test and retake it to be certain.

Brown discharge could be a sign of your period coming. Given that your period is abnormal due to your weight, I still encourage trying to make an appointment with a physician or nurse practitioner. They can also check for infections too. It is important to see what their recommendation is given that you do not have regular periods.