confused help! progesterone question!!

Alexandria

so i had my first official appointment today only with a nurse im 5w 3d they took blood and discovered my progesterone is low so they prescribed me just that. well i got the medication and in the instructions it says clear as day do not take this drug if you are pregnant?! i discovered it after hours and couldnt call so im turning to y'all! help! is it still safe for me to start it tonight?