Clearblue Digital Pregnancy Test can be used up to 4 days before your period is due. If you test before your period is due and get a ‘Not Pregnant’ result, there is still a chance that you may be ‘Pregnant’ but that your hormone level is still not high enough for the test to detect. See the chart below for results from clinical testing of Clearblue Digital Pregnancy Test with early pregnancy samples. If testing from the day your period is due, you can test any time of the day.  If testing early, use the first urine of the day.