I'm 3 days late and getting negative tests. why am i cramping so bad? like they're terrible, i can't bear it. is my period coming or am i pregnant?

Dysmenorrhea: Period may be coming. Normal period are every 3-5 weeks (21-35 days). If pregnancy test is negative then you are not pregnant. This home test are pretty good and reliable. If in doubt , see a doctor. Dysmenorrhea is painful periods (normal in many people). Try Motrin every 6 hours for the pain.

Uncertain: If pain is severe would seek medical assessment.