Progesterone dropping but still normal range?

l y s h✌🏻 • Mama x 5 🤍 + 👼🏻👼🏻👼🏻

I’m 5w6d today. And my hcg came back above 19,000 which is amazing .

But my progesterone went from 18.7 at 4w down to 15.1 just yesterday.

Is this cause for concern? My dr hasn’t called yet but I’m worried. Is t it supposed to be rising? Do I need to be put on supplements?