Deb - I did a search on this and they say that test lines that disappear are to be counted as negative, but yours aren't disappearing are they??
I have gotten a very faint, kinda like a shadow line at around 8DPO and as the days progressed they got darker.

I would wait until maybe a week and if AF hasn't arrived test again sweety... to you, I am hoping this is the real thing for you!!