Girls please help freaking out!!

I've don't 3 home preg tests all came back positive. I went to the hospital due to pains and previous miscarriages she done a preg test and told me it was negative. 
I don't understand!!! I'm freaking out!! 
It drank so much water today 2 litres so I wonder if maybe my urine is so diluted 
Any one had this before? They have done a blood test and will get the results in the morning