Too scared...

So it is 4days before af is due and although Glow is telling me to go for it and test....I'm too scared incase it's negative! I think I know it's goin to be negative as iv only had cramps and what could be defined as some acne (I don't normally get spots and I have them on back neck and cheeks!) But that's it, and I'm probably just hopeful that they mean something.not sure whether to just wait and see if af rears her ugly head or not...thoughts??