I am not trying to scare you or anything, but I had that problem too.
My HCG levels were not doubling, but they were going up, but not where they should be for how many weeks I was along. I had the bleeding as well. I ended up going to the hospital bc of it and they did an ultra sound and all that and told me that the baby was okay (they found it's heart beat) but to watch my levels as the baby was not measuring the right size (not too much) and my levels were not right.. Well by the time I was suppose to be 11weeks. My levels were only 7 weeks and I ended up losing the baby a few weeks after..The hardest day of my life.
I am sorry if this is not the best news, but I just wanted to let you know what could happen, BUT ON A GOOD NOTE. my doc told me that pregnancy have gone to full term and had a healthy baby when the levels have not gone up right. So good luck to you and keep us informed..I am hear to listen if you need anyone to talk to!!
Msg me if you need anyone to talk to. I know how hard and is and what you are going though.
Again sorry for not being the most positive person.