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Determining Ovulation

Two of the most widely used methods for determining ovulation are by charting your basal body temperature and your cervical mucus, both or which are directly related to your hormone levels.  The most accurate method for determining ovulation is the use of ovulation prediction test strips

By charting your details in a Cycle chart it is reasonably easy to determine when ovulation has occurred, and help to keep track of your cycles which will help you to use the Gender Selection System most accurately.

Basal body temperature

Your basal body temperature or temperature at rest is most accurately read when using a fertility or basal thermometer as soon as you wake (before any activity is undertaken).

Ovulation is said to occur around the time your body temperature shifts sometimes termed "the rise". In the beginning of your cycle (follicular phase) after day 4 your temperature readings will be low, just prior to ovulation your temperature will reach its minimum point having dropped by .12 -.3 of a degree Celsius, once ovulation has occurred (luteal phase), your temperature will rise usually by .2 -.6 of a degree Celsius, and remain consistently higher until just prior to menstruation.

However in some instances ovulation can occur up to 5 days before "the rise" and even up to 2 days after "the rise" so a cervical mucus reading is also required to help determine the time of ovulation.

Charting your basal body temperature

A temperature reading is taken every morning before any activity, preferably before getting out of bed. Login and record the temperature reading on your cycle chart for the cycle day that you are currently on. Be aware that freak high readings are common. This will only take a couple of minutes each day, and is an important ritual or routine to adopt.

Cervical Mucus observations

Your cervical mucus changes with the levels of hormone present in the blood stream. Early in the follicular phase cervical mucus is non existent or it is sticky, tacky, and often white, yellow or opaque in appearance.

As the levels of estrogen rise the cervical mucus becomes clearer, wetter and thinner, when the estrogen levels peak (just prior to ovulation) the cervical mucus becomes jelly like, pliable and elastic or stretchable, resembling raw egg white, often termed Egg White Cervical Mucus (not all women experience this kind of mucus). At the time of ovulation, the wet cervical mucus ceases.

Ovulation occurs (with 85% of women) on the day the wet or EWCM ceases, and (with 10% of women) the day after the EWCM has ceased. The clear, thin, wet mucus is produced up to 6 days prior to ovulation, this is fertile mucus. The EWCM is produced immediately prior to ovulation, this is highly fertile mucus.

Sperm cannot live in an environment free from fertile mucus, but can survive for up to 3-5 days in the nourishing environment this cervical mucus provides.

The average life span of a healthy sperm is between 18 -72 hours however some are still viable for up to 5 days, there is doubt whether 5 day old sperm would be capable of fertilizing an ovum, but to be on the safe side we will assume it is possible.

Charting your cervical mucus

It is best to check your cervical mucus several times throughout the day, this can be easily done when going to the toilet, by using a tissue or your fingers check the amount, consistency, color and texture. Login and enter your cervical mucus type into your cycle chart daily.

Within your cycle your will experience dry days, where no cervical mucus is detected.  You will also experience infertile mucus, this mucus when collected and observed is either white, yellow or opaque, and is thick, sticky and tacky.  Fertile mucus, when collected and observed is clear, thin, wet, watery and slippery, often in increased amounts.

The extremely fertile mucus EW or 'spinn' is not experienced by every woman, it has the consistency of raw egg white is wet and slippery to touch and can be clear or milky white. This egg white cervical mucus is jelly like and is elastic or stretchable.

Several factors can effect your basal body temperature and cervical mucus, illness, stress, breast feeding, fever, semen, alcohol consumption, lack of sleep, excessive smoking and life changes. Make a note of any of the above on your chart, and allow for unpredictable readings in the above cases.
OPK testing

The most accurate method for determining ovulation is by using an ovulation prediction kit, these are single urine tests, which will detect lutenizing hormone, or the "LH surge" which occurs just prior to ovulation.  We recommend you test twice daily at 12 hour intervals ( if you test at 8am then test again at 8pm that night ) and enter both positive and negative test results into the Cycle Charting program on the cycle days that you use an opk test
Make sure you follow manufacturers instructions and observe if you need to avoid drinking liquids for several hours before testing to ensure concentrated LH levels in the urine, some tests require the first morning urine others do not...so make sure you check the instructions before use.

To use the Smart Stork System for Gender Selection and the Cycle Charting program as accurately as possible, your opk  will have to be of a type that detects between 20 - 25 IU/ml or states that it detects between 24 - 48 hours prior to ovulation.


Be aware that if you suffer from PCOS and have elevated LH levels then opk’s may not be accurate for you.  Have your LH levels tested on cycle day 3, mid-cycle and 7 days past ovulation to determine if your levels are elevated or not.


If you are using Clomid (or another ovulation stimulating drug) you can still use an opk to help determine ovulation.




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