i also had that, and i had to go to the hospital it got so bad. turns out i as well i had bacterial vaginosis
I had a similar experience, cramping with brown discharge, and no period. I had bacterial vaginosis...nothing to worry about at all, just go to your doctor and they can give you antibiotics, the day I started the antibiotics my period came : )
Sounds like just an unusual period - these things happen. If you are concerned, you can see your doctor.