Do Progesterone Levels and NFP Help Confirm My Ovulation?


By Laura

You decided you are ready to start the process of Trying to Conceive, now what? For most women and couples, conception is a natural part of adulthood. It can be a part of that “whoops!” factor.  However, more and more woman are waiting longer to having children or grow their existing families.

Female fertility is a complex and delicate process uniquely designed to each and every women. While a woman’s age, health, and menstrual regularities contribute to a women’s chances of conceiving, women during any age of their child bearing years have the potential to become pregnant.

Did you know that a woman only has an average 12-48 hour window fertility time frame every month when ovulation occurs? Knowing how to pinpoint the signs of your fertile time to conceive will increase your chances of finding the sweet spot to better plan your baby dance.

Here are the basics to understanding ovulation

Ovulation typically occurs during the middle of a woman’s monthly cycle. Calculating your cycle days (CD) around your menstrual cycle is crucial for locating the average day(s) that ovulation will occur.

Predicting your period will help figure out your average cycle days in a given month.

1.   Calculating your average period cycle

To calculate your average period cycles you should count the days from the first day of your last period to the day before your most recent period started. For instance, your period started on the 6th last month and the 5th this month. There are 28 days in between. So, your period cycle would be 28 days.

2.   Pinpointing fertile days

Next, you can find your most fertile days. These are the days leading up to and including the day to ovulate. Using a 30 day month calendar, if your last period started on the 5th of that month, then CD 12 will begin on the 17th of that month. Most likely you may ovulate on the 21st or 22nd of that month. Your fertile days usually last about 5-7 days per month.

3.   Biomarkers

Your body will give signs during the time of ovulation. Biomarkers are present during a specific time in that month to prepare for the ovulation process.

Here are some telltale signs:

 Egg white cervical mucus – Your vaginal secretions change throughout the month from thick to thin depending on the time in your cycle. During your fertile days your cervical fluid changes to a clear, stretchy appears similar to egg white in order to allow an environment for sperm to live past the cervix and make the journey to the fallopian tube for conception.

Breast tenderness- For some women they are more sensitive to feeling the tenderness in their breasts. This is attributed to increase hormones that adds to biological attraction from the opposite sex.

Cervical position – During fertile days, the cervix will change from a firm, low position (similar to a marble) to a high open, and wet sensation (similar to a glazed donut). This can be felt by inserting a clean finger into the vaginal opening and distinguishing the difference in finger length left outside and texture of the cervix. (Tip – It is best to know your average cervical length throughout the month to compare)

Sexual attraction – Biologically during this time of the month you may have a higher sex drive or feel sexually more attractive increases your chances of engaging in sexual activity.

Basal temperature – Your basal temperature is your at rest thermometer that occurs first thing when you wake up everyday. The days of ovulation will show a basal temperatures at the lowest at rest body temperature, a spike will occur right after ovulation, and then go back into a baseline temperature until the following month. Many women use Basal thermometers to track the meniscal differences from day to day to better predict when they will ovulate and confirm the changes occurred right after ovulation.

LH surges – Your body will release a surge of Luteal Hormones (LH) 24-48 hours before ovulation occurs. OPK testing can help detect when your surges will occur and plan your baby dance during the time ovulation is most likely to occur. 

4.   Progesterone hormone increases

The days post ovulation are crucial as well. Your progesterone levels will increase and cause a progesterone surge. Progesterone hormones helps prepare the female body for conception and pregnancy.  Progesterone levels are low in the first half of the menstrual cycle (before ovulation) and increase several days after ovulation occurs.

So, if you are still unsure about whether you ovulated, we have testing kits for that as well. Our easy@Home Pdg testing kit uses Pregnanediol Glucuronide (PdG). It is the major urine metabolite of Progesterone. A surge will be read above 5 µg/ mL on our test better indicating ovulation did occur.  It can help identify low progesterone as well contributing to infertility issues to address with your doctor.

Planning a pregnancy can be stressful, but understanding your body can help you along your TTC journey!


For more questions about locating your ovulation, OPK or pDG testing products, and more, please contact us at 1.855.822.6999 weekdays M-F 9am-5pm, email at Make sure to browse our array of family planning products to help along your journey.