I havent had sex with my boyfriend, but we have fooled around quite a bit. I missed my last period, but before this expeirienced brown dishcarge that would last up to three days. One time the discharge came was one and a half wekks after my last gotten period. The other time it came was after i exercised. I have been loosing wieght recently and do not knwo if this is the cause for the missed period, or if i should be worried that i am pregnant. Please help?