Tmi: Dark red blood

I had dark red blood when I whipped last night. We went into the ER and they couldn't find a heart beat (no one there was trained). They took blood and urine samples and so far they've told me I had a severe UTI. This is our first pregnancy and I'm at 11 weeks and 4 days. I haven't soaked through a pad yet, but my periods have always been light. I'm freaking out has any ladies had this happen and continue on with a healthy pregnancy!?