I had low/slow rising hormones with this pregnancy and have had previous Miscarriages, I am now 26+ weeks pregnant and he is doing well.
Have your numbers been dropping? Were they higher and have gone lower or they have never gotten high? If they are not where they should be for 12 weeks and you are sure about your dates, can they not give you an ultrasound? Low levels can mean many things and an ultrasound is your best bet. You can have a miscarriage and it take awhile for the bleeding to start