6 weeks bright red blood

Kirsty
Hi. I had a miscarriage at 10 weeks in November. I got pregnant my first cycle and am now just short of 6 weeks. I woke up about an hour ago with bright red bleeding. Like the start of a period. Had my hcg levels done 1 week ago and they were more than doubling. I have an ultrasound today dr said to come right in. Is this another miscarriage? Any positive stories?