A pregnancy test shows right results only after 45 days after your last period so it may be too early. Do it after the 45th day get proper results.
If you have only taken one pregnancy test, wait a short while and take another. Sometimes tests show a false negative at first, especially if taken very early. However, periods can be missed for other reasons as well.
If it continues to show negative even after another test or two (wait a few days between each one), then it could very well be a different issue...stress is one of the top causes of irregular periods, and if you're very stressed about the possibility of pregnancy that could be holding it off. Best of luck to you, and perhaps revisiting your current contraceptive regimen might help with future stress :).
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