My period ended on 21st april, i had sex on 26th april, my period is 2 days late, now it's 15th may, i had to run a test this morning, it appeared negative, i'm confused, what's this supposed to mean please?

There are other reasons besides pregnancy to have a late period. Any kind of stress, both psychological and physiological, can cause a period to be late. Have you had any sudden changes, like weight gain or loss, exercise increase, etc. You can wait another couple of days and repeat the home pregnancy test. You can get in touch with your doctor and arrange a blood test to be certain. Good luck!