HCG on the rise but not doubling?

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Hello! My HCG has been everywhere, in order every 3-4 days the past couple weeks it started at 920,
to 794
To 720
Up to 1051
Up to 1502
So the nurse said its not the normal doubling in numbers we would hope for with a normal pregnancy but that "miracles can happen."
I still have all the symptoms I've had (nausea, tender breasts, dizziness and light cramps) and a positive test. No bleeding or painful cramping.
Has anyone had this happen and ended up with a healthy baby or a miscarriage?
This is my first pregnancy. Any advice or stories appreciated!! Thank you!