Too soon?

I'm supposed to start my period Tuesday and I am soo anxious to take a test.  Do y'all think tomorrow is too soon?  I've had some dull pains on my right side and sorry tmi, but pasty discharge the last few days that I don't usually have.  I'm really hoping these are good signs.  Eeeekkkk!  I will be sad if I test tomorrow and it's negative I just don't know if I can wait.