Beta levels

Hello! After 2 years of trying for baby #2, a loss last year, and 2 IUIs, we are PREGNANT!! I am so excited, but terrified of another experiencing another loss. My beta levels are increasing like they should, but they’re not as high as I was hoping. The nurse was very pleased with them, but I’m still so scared. Can anyone tell me if you had similar levels and had a healthy pregnancy? Thank you!

IUI

date-5/11

1st beta-5/25-43

2nd beta-5/27-141

3rd beta-6/4-1311 (this is the one that threw me off because I was expecting it to be much higher).