Help has anyone had this happen hcg beta ?? Not doubling and been okay?

Savannah ❤️💕💍👣👭👩‍👩‍👦🌷🌈

First at 11/12dpo was a 8

Second at 15/16dpo was a 42

Now at 17/18dpo it’s only a 52

No spotting or anything and I am on progesterone… I’m worried to death. 5weeks today… supposed to be anyways.