Has anyone EVER had a successful pregnancy with very slow rising HCG? (I’ve had multiple losses and I’m just curious.)

Here’s an example of my recent HCG levels:

Mar 1: 195

Mar 3: 310 (60% increase over two days)

Mar 7: 427 (28% increase over FOUR days)

I’m 99.9% sure I’m miscarrying so this question is purely for my own edification. I’m simply curious if it has happened to anyone that their numbers didn’t look good at first but it worked out. And, if so, how?