How to determine which day to start testing
If you would like to use a Clearblue® Ovulation Test and are wondering when you should start testing, this tool can help you.
If you don’t know your cycle length, we suggest you wait for your next cycle and note the day your period starts (Day 1) and the length of this cycle before using this online Ovulation Calculator tool*.
If you don't know your cycle length, we suggest you wait for your next cycle and note the day your period starts (Day 1) and the length of this cycle before using this online tool*.
If you don't know your menstrual cycle length, wait until you've had at least one cycle, then come back to use this calculator. If your cycle length varies by more than three days, choose the shortest cycle you've had in the last six months to work out when to start testing.
You should start testing on
You should start testing 17 days before you expect your next period
You should start testing on
You should start testing 20 days before you expect your next period
In this cycle, you’re missed the ideal date to start testing.
We advise you to wait for your next cycle before using Clearblue Ovulation Tests, as it is possible that you missed your LH surge in this cycle.
You should start testing on your next cycle
Cycle day default_11Your personal cycle information
| Start of your last period | |
| What’s your usual cycle length? | days |
This tool is for guidance purposes. Always use the leaflet provided with your product to work out when to test.
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