You have all the signs of ovulation or pregnancy but the test is still negative? The timing of your test is crucial. Testing too late or too early could give you false results.

Ovulation tests predict ovulation by detecting a surge in Luteinising hormone which happens 24-48 hours before your egg is released. Commonly ovulation occurs on about day 14 of your menstrual cycle. However, if you have a shorter cycle then ovulation will happen earlier, and if you have for example a luteal phase defect then it could happen later.

When to take an ovulation test

(The length of your cycle is counted from your first bleeding day (day 1) to the day before the next bleeding begins.)


Ovulation and pregnancy tests are very reliable when performed correctly but could be affected by:

  • Testing too early :  you could get a negative test even though you might be having some ovulation / pregnancy signs.  Most pregnancy tests are 99% accurate when taken a day after a missed period.

  • Testing too late : with ovulation predictor tests / LH tests you may have missed the hormone surge and get a negative test result even though you could be ovulating.

  • Testing at the wrong time of the day : Ovulation tests should be taken at lunchtime or afternoon as the hormone is made in your body early in the morning and might not appear in your urine until the afternoon.
    Ovulation tests should be done at the same time each day.
    You should use pregnancy tests with the first bathroom visit of the morning – especially if you are testing early in your pregnancy.

  • Medications : Some may affect test results eg birth control and some antibiotics.

  • Medical conditions : like PCOS could give false test results.

  • Weight : Being overweight or severely underweight could potentially affect test results.

  • Dilution : Drinking too much liquid in the hour or two before taking a test could affect the test result. This is especially true for saliva ovulation tests, which can also be affected by smoking and eating before testing.

pregnancy tests


So what can you  do to ensure accurate and true results that you can trust ?

  • Start testing for ovulation very early in your cycle and keep on testing until positive. This is especially helpful if you are new to testing and not sure when you usually ovulate.

  • Track your cycle for a few months and record these details. This will help you predict when you will ovulate.

    Let our Fertility Tracker chart help you

  • Read instructions carefully before testing.

  • Use high quality tests from reputable suppliers.

  • Use another method of confirmation eg. if you usually use the urine ovulation predictor tests then consider confirming re