Hcg Level 6w2d

So my hcg level was 5,253 at 6w2d! My level before that was 284 at 4w6 days I think. Based off the hcg calculator I’m doubling every 57 hours! I’m a little worried! I thought my levels would be around 8,000 by now! I’m going to LabCorp Wednesday to check again for myself! Anyone else with these numbers? I am now 6w6d as of today so I’m hoping Wednesday I would have gone up a lot higher. My progesterone is also 10.2, I have an appointment the 28th for an ultrasound but I’m so worried