Ahcg Rise blood test good?

aloha7

12dpo HCG : 54

progesterone 60.6 nmol/L (19ng/mL)

17dpo HCG: 644

19dpo HCG: 1311

progesterone 83.9 nmol/L (26.38 ng/mL)

how is my hcg looking? it was way more than doubling at 17dpo but at 19dpo it slowed down and doubled only 48 hours.. i am concerned about it slowing down?

opinions?