Question: I do not know my cycle length or my cycle length varies. How do I know when to start testing?
If you don’t know your usual cycle length, you are advised to wait for at least one menstrual cycle, and note the length of this cycle, before using Clearblue Digital Ovulation Test. Once you have determined your cycle length you can use the instructions to work out when to start testing.
If your cycle length varies by more than 3 days, then choose the shortest cycle you have had over the last 6 months to work out when to start testing. It is possible you may need to start a new pack and use the new Test Holder and Test Sticks to detect your LH surge.
Alternatively, if you wish to start testing without knowing your cycle length, we recommend you start testing on day 10. (However, in this case it is possible you may miss your LH surge because you have started testing too late or you may need to start a new pack to continue testing.)