How soon is to soon to take a hpt?

Rebecca
Af is due on the 9th my periods run from between 22 and 28 days long. This is my first month on clomid. Alls I want to do is test.... but when I do I get so depressed cause it's negative. Am I testing to early . I bought a few cheap tests then a few clear blue test. I want to test so bad. How soon can I test?