I had intercourse on march 1st im testing since then from mornin urine, always negative. can i trust the result after thank much time? thanks

Wait....: Wait for a missed period if there are normally regular periods. When a period is missed by a week, do one urine pregnancy test. If done properly, that single test will tell if one is pregnant or not. If there are irregular periods, just do one pregnancy test about 3 weeks after sex. If the test is negative, it's ok to repeat it once, 1 week later. Save money ; time by not doing unnecessary tests!