think I'm going to miscarry

I'm in the er for bleeding I've been having today. It's not bad it comes and goes but it does look similar to period blood. And when I went to the bathroom after my ultrasound something came out and it looked like a piece of tissue. I'm not having cramping or anything really. But I don't feel nauseous anymore really. I just feel I have adversions. They said I have a hemorrhage by the plecenta so that's causing bleeding probably. I'm alone at the hospital right now and really scared. The fetal heart rate was good 141 7 weeks 1 day. But they said now its natures call.