Beta #4, progesterone ?

sterpstra10

I am 5.5 weeks and had beta #4 today which was 20,134 but my progesterone has me a little worried.  My progesterone was 63.1 when I was on 200mg oral progesterone, so they put me down to 100 mg and now it's 23.2.  They want me to go back to the 200mg and will re-check my levels when I have my first ultrasound in a week (yay)!  But I can't help but be worried........can you ladies either ease my mind or justify my worrying?