Beta went down slightly... happen to anyone else?

Ready2013

I am about 6 weeks right now. I had my beta tests done last Mon, Wed and Fri. I just got my results from Fri and they went from 562 on Wed to 546 on Fri. They are having me go in again to test and see where my numbers are at today. Has anyone had a drop in beta and been okay? I am really worried. I feel fine, but I am very nervous.