the best thing to do hun is do another test first thing in the morning and see what that says, I know it seems like tomorrow is forever away but that is the best thing to do and you should know for sure then,
I'm not a big fan of the clearblue digital tests, I know someone who was 7 months pregnant and it came back as 'not pregnant'!! I prefer the first response tests and the normal clearblue ones with the cross for pregnant
good luck! xx