If you are a week late for your period and have received negative results on multiple home pregnancy tests, it is possible that you may not be pregnant. However, there is still a chance that the tests were taken too early to detect the pregnancy hormone (hCG) in your urine. It is recommended to wait at least one more week after your missed period before testing again to allow enough time for hCG levels to rise if you are indeed pregnant. Additionally, make sure to follow the instructions on the pregnancy test kit carefully and use the first urine of the day for optimal accuracy. If you continue to receive negative results after waiting another week or experience any unusual symptoms, it is advisable to consult with a healthcare professional for further evaluation and guidance.