I'm on 48days cycle and am yet to see my period and have done pregnancy tests it's keeps showing negative. what is actually happening to me?

Tests are accurate: Today's home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A home urine test will give a reliable result 3 weeks after sex (3 weeks after when conception might have been) or 1 week after missing a period. One's regular primary or Ob-Gyn doctor can give an opinion on the 48-days, as that sounds very long.