Is it normal for the past couple of months just before my period is due i have had this brown/blackish like discharge for about 4 days before i'm due?

Brown = old blood: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections ; hormonal changes can cause spotting. Brown simply indicates old blood and is normal. There are many options available to help regulate the menstrual cycle. Schedule a visit.