Low Doubling 22dpo

After two losses, I’m feeling nervous about my beta numbers after IUI. Today I am 22dpiui and numbers are below:

13dpiui: 44

15: 91

18: 315

21: 788

Between 18-21 this is more of a 54 hour doubling rate. I know this can be normal but can’t help but feel

SO nervous about this. However, I do have a slight dye stealer on Pregmate today (in comments). Please help give me a realistic opinion. Thank you so much!