Progesterone levels

Hey ladies! On vacation so can't call the doctors till later this week. But I wanted to ease my mind. My progesterone level at the end of August was 57.8 and on sept 8th it went down to 41.14. Does anybody know if this is a bad sign? I'm really hoping everything is ok. I'm about 6.5 weeks right now and my next appt isn't until October. Thanks for the help!