HCG levels rising, first ultrasound abnormal


My first US was at 6w1d and my OB said what she saw was abnormal and the pregnancy wasn't progressing the way it should. She saw fluid and tissue in my uterus but nothing concrete. She told me to prepare myself if this doesn't end in a viable pregnancy. That same day I had my labs drawn - HCG levels were 21k. Two days later they were 32k. Two days later they were 41k. I won't have my next ultrasound until January 10th but I'm super stressed right now. These past two days I've had a small amount of brown discharge. I've read similar stories that ended well and also some that ended not so well. Ten days is a long time to wait and not have any clue what's going on. Has anyone had anything similar happen?