OB-GYN appointment post Miscarriage

Whitney
After going to the ER last night & being told I was having a miscarriage, I went to my OB-Gyn for a follow up appointment. 
    
They want to do another ultrasound because the one I had Sunday showed a live baby w/a heartbeat. They also want to recheck my HCG & state that it could be low due to me being anemic. Also, the bleeding could be due to my uterine fibroids. 
I'm still being listed as having a miscarriage but I guess they're trying to "confirm". I'm so lost. I feel helpless.