When the Monitor has detected a rise in estrogen it will display High. On subsequent days the Monitor looks for your LH surge and will continue to display High until your LH surge is detected and Peak is displayed. If the LH surge is not detected and Peak is not displayed you may see more High days than expected. This can be as many as 19 days. If this happens it is unlikely that you are fertile for the whole of this time. It is important to continue to test as requested by the Monitor.