low HGC levels

woke up this morning bleeding and cramping. Went to the emergency room. has a ultra sound and a vaginal ultrasound...nothing seen. my HGC levels are only a 9.5 which are too low for how far along I was told (6 weeks) He said one of 3 things could be happening. 1. miscarriage 2. I'm nowhere near as far along as I was told. 3. something else is cause HGC in my system. So now I have to wait a week and get my HGC levels checked again if they grow, I'm still pregnant. if the disappear, miscarriage. stay the same, something else caused levels. I think it's a miscarriage because I started bleeding again. I'm heartbroken for myself. but even more for my husband. he was so happy and excited.