I'm 20 days late i last tested about 3 days ago and negative result am i testing too soon ?

No, not to soon: Most home pregnancy tests are very accurate after 5-7 days of missing your period. It appears that you have had several negative tests. I would suggest a blood test for confirmation and a consult with your physician for possible other reasons for not having your period. Good luck and take care.

Not too early: Many women test after they miss their period. Accuracy will be even higher if they wait an additional 7 days. If you were 20 days out your pregnancy test would reflect that.