Hcg levels rising more slowly this time

Hi all! Question for women who have tracked Hcg levels over multiple pregnancies...

With my son, my Hcg levels rose at a rate of 2.4 every 48 hrs (204 at 15dpo, 490 at 17dpo, 1193 at 19dpo)

I am 4 weeks 1 day pregnant and HCG level seems to be doubling every 48 hrs, (34 at 12 dpo, 102 3 days later at 15dpo) which is slower than a rate of 2.4 from last time and makes my overall levels lower at the moment.

Don’t get me wrong, I am thrilled that I am at least doubling, but I can’t help but wonder if a rate of 2.4 is more “normal” for me. Have other people had this kind of variation between pregnancies? Thank you!!!

I know, I shouldn’t worry. I will worry until there is a heartbeat and then I will breathe :) thanks for helping a mama out