Hcg levels didn’t double :(

Jill

So I went on friday to have my blood drawn. My hcg levels were 416 (4wks 5 days). I️ had blood drawn again yesterday and I️t was 540. I know it should have at least doubled and, likely, things won’t end well for our little bean. But wondering if any of you have experience with non-doubling hcg levels... good or bad??