I'm losing my baby...

I started bleeding quite heavily during the night so my partner took me to the walk in centre. They did a pregnancy test, which was negative. The doctor was so patronising and thoughtless. Basically said he doesn't think i was ever pregnant. We told him i was. We did 4 tests over a week and they were all positive. I know that i'm miscarrying. My bleeding is so heavy and i'm in so much pain. I just dont get why my urine test came back negative for te doctor? I'm booked in to have bloods taken tomorrow, and then again on thurs. I'm guessing that'll confirm me miscarrying. 
I really dont know how i feel. I mean, i'm obviously devastated. But i feel like cos i was only 6 weeks i shouldn't be this upset?