Brown discharge and pregnancy
It may happen so that pregnancy is not yet established, while a woman observes spotting before the expected period. In this case, it can point to both the adhesion of ovum to the uterine lining (implantation bleeding) and to the disturbance of a normal or ectopic pregnancy.
An important distinctive feature of pregnancy is painless implantation, whereas threatened miscarriage is usually accompanied by severe cramps. Besides, in case of voluntary interruption of pregnancy, the discharge not only remains brown, but it gets more intense and thick. One may even have scarlet blood and blood clots in the discharge.
Thus, in any case brown discharge before period serves ground for a visit to a clinic. Even if it has physiological causes, it would be better to make sure in that, based on the opinion of a gynecologist. Brown discharge with matter admixture, as well as brown secrete, associated with the rise of body temperature and accompanied by significant dragging pain in the abdominal area, require immediate visit to a clinic.