I can't stand the ER... Threatened Mc

Amanda
So on Thursday I went to my obgyn for my 10+ week appointment. I was having cramping and pain in my back that made me nervous. My doctor said she thinks I'm good and just had stretching from the baby... So she tested my urine and found a tiny microscopic amount of blood I my urine (nothing seen by human eyes). So she said just in case go to the ER because I may have a UTI or kidney infection. So I went to the ER and I told the PA that I wasn't bleeding and they just found a microscopic amount in my urine. So they ran blood tests and did ultra sounds. I got to see the baby! The baby had a good heartbeat and measured exactly how it should. The PA came back later and said all my tests were fine and they found nothing wrong. Yet...... On my final paperwork it said "threatened miscarriage." I was furious and had no idea why it said this. Has anyone else had a doctor tell them this?