A negative home test done this early is fairly reliable, but a delayed period with a negative test is often from stress, travel, weight changes or a one-off cycle without ovulation rather than anything serious. Even with a regular 28 to 30 day cycle, an occasional week's delay isn't unusual.
Next Steps
Repeat the urine
pregnancy test in 3 to 4 days if your period still hasn't started, since very early tests can sometimes read falsely negative. If it stays negative and the delay crosses 2 weeks, please see a gynaecologist for a check and a basic hormone workup.
Health Tips
Get seen sooner if you develop pelvic pain, spotting or dizziness.