I have been experiencing brown discharge for 7 days and my period is supposed to start tomorrow. My last period was on the 4th of September and Ive experienced pregnancy symptoms such as food aversion, cravings, swollen breasts and pain, nausea, fatigue, etc. I'm on birth control but i missed a couple pills. I took a first response pregnancy test and it came back negative. The brown discharge I've experienced has lasted longer than my normal period which is usually 6 days. Can anyone tell me if I should be worried?