Suggest Treatment For Abnormal Vaginal Bleeding With Abdominal Pain

Hi, I don't have my period right now and I have severe pain in my abdomin I am also having clots of black stuff coming out of my vagina (discusting I kno!) But I don't know what's going on and its scaring me my last period was about 2 weeks ago and I don't know what to do I'm in a lot of pain. Please help