I had a positive pregnancy test and 4 days later started bleeding, I already had my 1s appointment with my gp the next morning so went along, he referred me to the early pregnancy department at hospital which I had a negative test. They done a blood test which showed my hcg levels were low so they confirmed it as a miscarriage. Its been 3 weeks today and I still feel pregnant and look pregnant, I was wondering if I could still be pragnant as no one done a scan to check or even felt my stomach, I only had 1 blood test and I have not passed any sac or tissue. Any info will be very very greatfull

There's really no way for anyone on the internet to tell you whether you're still pregnant.

It's possible that you didn't miscarry and the test at the hospital was wrong, but you yourself said that you started bleeding. You won't see the sac, or tissue in early miscarriage. It will likely seem like a normal period.

If you think that you may still be pregnant, try another pregnancy test, or go to the doctor and request another blood test. That's really all you can do, other then wait and see.