There are many causes of abdominal pain and PMS (pre menstrual syndrome) is one of them. If the pain is severe, progressively worsening or is there for more than 1 or 2 days, you should see your doctor. Discharge usually starts up to a year before your period starts, so your periods might start soon. Don’t be nervous, periods are a normal part of life. Talk to your mum, sister or a friend if you need someone to talk to about it.