Could I Be Pregnant If I Haven T Gotten My Periods Since More Than A Month Ago, Despite Having A Negative Pregnancy Test A Week Ago?

Hey,my periods have been delayed, my last period came on 20 march next month in april 21 I did intercourse (protected) and that month I still didn t got periods and even in this month may I didn t got my periods yet I am very confused if I am pregnant or not because one week ago I did urine pregnancy test two time and I got negative result.