Faint lines on pregnancy tests can indicate a positive result, even if they are not as dark as the control line. It is possible that you are testing too early for accurate results, especially if your period is still a week away. The hormone levels required for a clear positive result may not be high enough yet. It's recommended to wait until after your missed period or at least a few days before it to retest for more accurate results. If you continue getting faint lines after this time, it's advisable to consult with a healthcare professional for further evaluation and confirmation of your pregnancy status.