Progesterone and hcg levels

Caitlyn β€’ πŸ‘ΆπŸ» πŸŽ€ 12/17/19 πŸ‘Ό 12/18/20 πŸ‘ΆπŸ» due 10/18

Is it normal at 4 weeks 4 days for your progesterone to drop by 3? I have heard it fluctuates throughout the day. Waiting to hear from the doctor. 19.8 at 4 weeks 2 days to 16.8 at 4 weeks 4 days