I am 20 I have had my period since I was about 13, And up until about a year and a half ago it came regularly I never missed a period. When this started I had just gotten out of a bad relationship and my father had just passed away and I was dealing with school and it was very stressful so my doctor said it was just the stress and that I shouldn't worry about it. But when It started I would get my period like every other month, then it was every 3 months, It was once 6 months between periods, and now I haven't had one for about 5 months, but the other day I had some stomach cramps, which is unusual because I never have cramps, just lower back pain, and what looked like blood on the toilet paper but nothing ever happened, that was like 3 days ago and today I had brown discharge but its not like blood. I am a virgin so I know its not an std. I was just wondering what it could be.