Miscarriage

I can't stop crying!! My eyes are swollen and my fiancé has been crying too. I started bleeding and cramping and went to the hospital.. I was there for 6 hours and pretty much no answers!! I don't know how or why it happen .. It's not even positive it did yet!! But I think it did.. I know it did.. And I've never felt this hurt in my life! I'm so emotionally unstable. And in so much pain physically and emotionally. And when I left the hospital they said my blood hcg levels were 19 but suppose to be in the 100s if I'm still pregnant ..  I took this test and it makes NO sense!! And I didn't even bleed that much ? I bled LESS then my period!? I don't understand!! The bleeding and pain started after and during I had intercorse that morning .