Feeling lost

My husband and I finally are pregnant with our first. Two days ago I started bleeding, so I went in for an ultrasound. The baby is still there, but I’m six weeks and the heart rate is only 85 bpm. I have to go for another ultra sound this week. My doctor made it seem like There is little hope. The bleeding stopped last night, but now has started lightly again. I’m at a loss and having such a hard time. I’m trying to remain positive, and my husband is so supportive, but I’m so scared.