Early HCG Levels


So, I found out super early I was pregnant due to fertility treatments, etc.

First HCG was 3 weeks, 3 days, at 24.

Second was 3 weeks, 5 days, 56.

It’s doubling but they want me to go in since first one was so early again tomorrow, 4 weeks, 3 days.

Anybody with any experience in this all being fine and normal? I know there are ranges but we’ve been TTC for 6 years and have had 2 m/c, so now I’m just freaking it a little. They want to wait to schedule u/s until the next set of blood comes back.