I'm not on birth control i spotted brown blood for 5days a week before my expected period and my period never came on i'm 19 days late on my period and my great hurt and all negative pregnancy test. could i be pregnant ?

Unlikely : Assuming you oerferimed the preg test correctly, a negative test is pretty reliable. If you were pregnant, the test would show positive by your missed period. There are many reasons for delayed cyckes: medications, stress, diet, etc. If you are two months late, seek medication (prescription) to help trigger one. Birth control may also help keep you regular of desired.