Miscarriage impending?

Hi everyone, I’m on progesterone supplements due to low progesterone levels so I’ve been getting labs drawn quite frequently. Everything was looking good until this last draw and now I’m stressed a miscarriage is coming. Here were my levels:

12/4: 75 - 3w5d

12/9: 1140 - 4w3d

12/12: 3266 - 4w6d

12/16: 11959 - 5w3d

12/19: 19390 - 5w6d

So that last number didn’t quite double. I know that once you get closer to 6 weeks it starts slowing down but I’m worried that wasn’t enough for a jump. Thoughts? Success stories?