For a viable pregnancy hCG levels should really be doubling or more every 36-48 hours. There are some cases where some women's levels just don't rise the same way as others but the pregnancy is still viable. Unfortunately there is nothing you, nor the doctors can do at this point but wait it out and see what your hCG levels do. If by the next test they're still rising, that should be a good sign. It's if they've stopped rising or have fallen, that then that would indicate miscarriage.
If they're not doubling then I'd suggest there may be something just not right. Maybe in time they'll start to double. If not, I hate to say this but expect the worse, but hope for the best. I'll pray for you they double. Gud luck
Is tht the blood test? My sister always xame up negative with urine so she had to have the blood work done to show anything.