HCG Levels

ariel

So my lmp was July 3rd …got my hcg draw on Monday it was 371 and then 48 hours later it was 499 it only increased by 34.5%. I go back tomorrow for a 3rd …I had a miscarriage in 2019 and needed fertility treatments to have my son in 2022 so I am very nervous …anyone have experience with HCG not doubling?