So scared! Progesterone levels

Shelby

My progesterone levels have been decreasing, 8 at 5w, 5 at 6w, 4 at 7w. My hcg has been tripling every few days and last time was 3.5K. I also had an ultrasound at 7w and saw my baby with a consistent heartbeat of 130bpm. I’m already on vaginal supplements.

Should I be worried? What happens if it keeps going down?