The conception indicator is 92% accurate at detecting when you conceived. The estimate is based on the level of hCG in your urine. The level of hCG varies from women to women, and it is therefore possible that the conception indicator might occasionally give misleading results. The accuracy of the 'pregnant'/'not pregnant' result is over 99% accurate when testing from the day the period is due.
Read the instructions fully before use. How early can I test & at what time of day? Clearblue recommends that you test from the day your period is due, in which case you can test at any time of the day. However, for an accurate Conception Indicator result, you must use the first urine of the day.