We launch the world’s first dual-hormone Fertility Monitor to indicate all the fertile days of the cycle. Experts recommend waiting 7 days after ovulation to take a pregnancy test for the most accurate results. This is because hCG (a hormone produced by the placenta when an embryo implants in the uterus) may not be detectable by a pregnancy test so soon after conception. Can I test my fertility at home? We launch the Clearblue Pregnancy Test System, which is the world’s first rapid pregnancy test that gave accurate results in just 30 minutes.

You can see more about our products in the comparison chart below to get a better idea about the different Clearblue ® tests and monitor that are available.

When to start ovulation testing with irregular cycles

Ovulation test kits are tests that let you know the days when you're most fertile and likely to conceive. They're particularly useful for women who have erratic cycles.

If your cycle is shorter than 21 days or longer than 40 days, consult your doctor. If you do not know your cycle length, you may begin the test 11 days after your first period since the average cycle length is 28 days. Perform 1 test each day until the LH surge has been detected.But if she has a regular 28 day cycle, she should start off testing from day nine to 10 onwards. With each month she will get to learn about her cycle and can reduce this.' To manually work out how long your cycle is, note down 'day one' – this is the first day of your period (not just spotting) and record how long it lasts, right up to your new 'day one.' How long after a positive ovulation test do you ovulate?

Less messy than a urine test, this kind of ovulation test may take a bit of time to get to grips with but the benefit is that it’s reusable – and more eco friendly – and may work out cheaper in the long run. We think the Clearblue Advanced Digital Ovulation Test Kit is the most accurate ovulation test on our list. It gives you a high chance of pinpointing your most fertile days and purports to be in excess of 99% accurate at detecting the LH surge. How we chose our recommendations An alternative to urine testing is saliva testing also called fertility ferning test. You place a drop of your saliva on the lens and wait for it to dry before examining it; if the sample looks like blobs, you’re not in a fertile period, but if it looks like ferns, it’s a good time to try for a baby. Prof Harper advises against trying at-home fertility tests. 'In my view – any [fertility] test at home is pointless,' she says 'They measure a few hormones but these hormones in isolation do not tell you anything. Center for Devices and Radiological Health. “Ovulation (Urine Test).” U.S. Food and Drug Administration, FDA, 2 Apr. 2018, www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/InVitroDiagnostics/HomeUseTests/ucm126065.htm.

Ovulation results become clearer with our first Digital Ovulation Test, which gave you clear results with a simple smiley face. If your cycle is normally 28 days, the cycle chart above indicates you should begin testing on Day 11. The calendar below shows you how to work out when day 11 is. With long cycles, you may have taken a test too early. Start taking them 17 days before your expected period or three days before potential ovulation. Continue until the result is positive. Hold the midstream test by the handle with the exposed tip pointing downward, directly into your urine stream for at least 10 seconds until it is thoroughly wet.

For example, your shortest cycle was 20 days. The luteal phase lasts for about 10–16 days. Starting at the end of your cycle (day 20) and subtracting the 16 days of the luteal phase, the predicted ovulation may be expected on day 4. Start doing tests three days before that, on the first day of your cycle. Generally, you should begin testing around three to four days before you think ovulation should occur.I used the advance one, I had a chemical pregnancy in cycle one and was wanting to maximise chances after that, it was very helpful, I ovulated a couple of days later than expected, pregnant 4th cycle (now 16 weeks) and dates spot on with ovulation test."(Tried and tested by Mumsnet user HeyBlaby) Our verdict One to UK's most popular is Clearblue, used by millions of women – it has a reputation for being reliable and easy to read. Depending on the test you choose, you can even predict up to 4 of your most fertile days every month. (See more details below.) How do ovulation tests work? Monica Moore is the founder of “Fertile Health, LLC”, a consulting company created to train new nurses in reproductive endocrinology and to encourage nutritional practices into fertility centers. She is a Women's Health Nurse Practitioner, and was one of the nurse managers at Reproductive Medicine Associates of Connecticut (RMA of CT) and continues to work as a consultant for them. Prior to joining RMA, Monica was the donor nurse coordinator at the Atlanta Center for Reproductive Medicine. Monica's first job in reproductive endocrinology was at Cornell Center for Reproductive Medicine and Infertility 20 years ago. A pregnancy begins with conception. A child is conceived when the male sperm successfully fertilises the female egg. Successful fertilisation is most likely during a 24-hour period following the L.H. surge. Since this window is only open once a month and for a short period of time, being able to predict the L.H surge is very helpful when trying to become pregnant. I had a positive result for the L.H. Surge and had sexual intercourse during this period but I have still not become pregnant.