I THINK IM HAVING A MISCARRIAGE PLEASE READ AND HELP ME

Out of no where all my pregnancy symptoms stopped I started having diarrhea last night and extreme stomach and back pains. I feel  nauseous and now I’m having extremely large and dark red/brownish blood clots come out of me. I know it’s not my period because I never get clots please help me I’m scared, alone, and in pain. ( a picture of the first clot that came out)