miscarriage

i am devastated. I don't know what I do wrong. second miscarriage, yesterday was brown discharge with red blood following an hour after... my SO rush me to ER I was crying and had a lot of pain.. this morning no sign of blood or red or brown........ as I'm typing I'm on the loo with so much pain and red blood... I surely don't know why this must happen to me after 4 years of trying...