Go get checked out again it's not normal to bleed and even though you tested and it's positive that doesn't mean you're not having a miscarriage your hcg won't drop to 0 till the fetus is gone
And try not to stress I no easier said then done but try and stay off your feet and drink a lot of water that could help with the cramping!!
Go back to the er they need to find out why u are still bleeding !!! Is it heavy or just spotting? I don't want to scare you or worry u but my test also came back positive when I was going through my miscarriage!!! I pray that that's not happening to you!! In my prayers and good luck to you