HCG week 4 HELP!

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We did <a href="https://glowing.com/glow-fertility-program">IVF</a> and did a FET 5/8/19. My hcg number on 5/17 was only 54. On 5/20 it was 74. Did ANYONE not have their HCG double correctly and still have a healthy pregnancy?!?! I go in to test again 4/22. I'm soooo nervous!!! I should be 4 weeks and 3 days today. But I'm nervous I might miscarry 😭