I dont understand??? Could i still be pregnant??

Okay so about 2 weeks ago I got a faint positive go to the doctor about a week later she did a urine test and it came out negative with my period being 6 days late she wanted to do a blood test Friday I go for a blood test but I started to bleed the bleeding didn't even last 24 hours when I go back to get the results for the blood test they came out positive because it started bleeding she did another blood test could I still be pregnant or do you think I miscarried I've never had a miscarriage before so I'm not sure what to expect there wasn't a lot of pain with the bleeding and no blood clots I even went to a concert Friday night any help would be appreciated