How do I calculate my fertile days if I have an irregular menstrual cycle?


Women who have irregular menstrual cycles can also determine their fertility days. I calculate my fertile days using the ovulation calculator provided below.

First, the doctor must rule out health problems.
calculate my fertile daysA woman’s menstrual cycle is considered regular when it lasts 28 days. It is even still considered normal if it lasts between 24 and 32 days.

However, for some women this timer is not so accurate and there is talk of having an irregular menstrual cycle.

Menstruation can reach 24 days compared to the previous month, then 28 and then 32. Even, it may not come in a month menstruation.
When these jumps are presented in the periodicity from one month to another, the period is considered to be irregular.

Of course, determining which are the fertile days when you have an irregular menstrual cycle has its complexity. It requires visiting the doctor to rule out diseases and having patience to determine how the cycle behaves, but it is not impossible.

1. When Is The Menstrual Cycle Irregular?

After menarche or first menstruation, an irregular menstrual cycle is considered normal.
This irregularity can be maintained for the first few years after menarche, but once the hormones stabilize, menstrual cycles should be regular.

If not, there could be hormonal or physical disorders that require a timely medical evaluation to prevent future problems.
When cycles last less than 24 days, they are called poly menorrhea. When they last more than 35 days, they are called oligomenorrhea.

Any of these cycles can have a very variable duration from one month to another.

2. What Causes An Irregular Menstrual Cycle?

Among the physical causes that can cause an irregular menstrual cycle, permanently, are:

  • Diabetes.
  • Anemia.
  • Problems in the thyroid.
  • Excess prolactin(a hormone that stimulates milk production).
  • Polycystic ovaries.
  • Fibroids.

All of these problems are treatable. A timely diagnosis helps a woman to regain her regularity and control fertility.
Also, there may be emotional or medical factors that can disturb the regularity of menstruation:

  • Stress.
  • Anxiety.
  • Worry and anguish.
  • Eating disorders such as anorexia or bulimia.
  • Oral contraceptives.
  • The intrauterine device.
  • Taking steroid or cortisone medications.

All of these factors are equally treatable.

3. How To Know Which Are The Fertile Days?

When the menstrual cycle is regular, ovulation usually occurs 14 days before menstruation.
When having an irregular menstrual cycle, a woman can be guided by ovulatory symptoms to determine what her fertile days are. That is, you have to know your body.

Changes In Vaginal Discharge

At the beginning of the menstrual cycle, the vaginal discharge is whitish and thick.
As the time of ovulation approaches, it becomes more transparent and fluid to facilitate the transit of sperm to the uterus. They are the days of greatest fertility.

Abdominal Pain

Ovulation abdominal pain resembles PMS, although it is rare. Some women can feel it only on the side of the ovary where ovulation occurred.

Changes In Basal Temperature

Basal temperature is the temperature that the body shows as soon as it wakes up.

If a record of the body temperature is made every day of the month, it is possible to determine the moment of ovulation, since it implies an elevation of 0.2º to 0.5º.

Other Symptoms Of Ovulation

The breasts may be tighter and sore. Libido increases. The skin appears brighter and more youthful before ovulation occurs.

These symptoms are not easily distinguishable, they can even go unnoticed, since their intensity depends on each woman.

4. How To Determine The Fertile Days?

In the pharmacy it is possible to acquire the following tests that are very effective in determining when ovulation occurs: LH ovulation test.

It is a urine test that measures the presence of the luteinizing hormone(LH), responsible for ovulation.
This test is easy to use and allows you to determine if ovulation will be in the next 24 to 36 hours.

Estrogen Ovulation Test

This test measures estrogen levels in a woman’s vaginal discharge or saliva.
It detects ovulation three to four days before it occurs.

Ovulation Calendar

To have a calendar of your ovulation you must keep a record of how many days there are between the first day of a menstruation and the first day of the next.

So, for 6 months; it takes time, but it is effective.

When To Visit The Doctor?

Although irregular periods can be normal in some women, it is advisable to visit the doctor on some occasions.
The Department of Gynecology at the University of Pennsylvania recommends it in these cases:

  • If you spend more than 90 days without it arriving.
  • When it suddenly starts to be irregular.
  • When it lasts more than a week.
  • If it is more abundant than normal.
  • When you bleed between periods.
  • In case there is unusual pain.

Understanding Ovulation To Calculate Fertile Days

Ovulation is a crucial part of the menstrual cycle where an egg is released from the ovary. Knowing when you ovulate can significantly increase your chances of conception. The fertile window usually spans six days, including the day of ovulation and the five days before it.

Various methods like basal body temperature tracking and ovulation kits can help you pinpoint these crucial days.

How To Calculate My Fertile Days? Tools You Need

In today’s digital age, several tools can help you calculate your fertile days. Ovulation calculators and fertility apps often use your menstrual cycle’s average length and the date of your last period to estimate your fertile window.

However, these tools should be used in conjunction with other tracking methods for the most accurate results.

Common Myths About Calculating Fertile Days

Contrary to popular belief, not every woman has a 28-day cycle with ovulation occurring on day 14. Cycle lengths can vary, affecting your fertile days.

Another myth is that frequent intercourse can reduce sperm quality, which is not true. It’s advisable to have regular sex, especially during your fertile window, to increase the odds of conception.

How To Use FitWomenHealth Ovulation Calculator?

Below is a step-by-step guide on how to use the ovulation calculator on your website. This guide is designed to be user-friendly, ensuring that even those with minimal technical knowledge can easily navigate and utilize the tool.

  • Step 1: Input the Date of Your Last Period

You’ll see a field asking for the date of the first day of your last menstrual period. Input this date in the format YYYY-MM-DD. This information is crucial for calculating your fertile window.

  • Step 2: Enter Your Average Cycle Length

The next field will ask for your average menstrual cycle length in days. If you’re unsure, a 28-day cycle is the average for most women. However, cycles can vary, so it’s best to track yours for a few months for a more accurate number.

  • Step 3: Provide Additional Information

Some calculators offer more advanced features, asking about your stress levels and exercise habits. This information can fine-tune the calculator’s accuracy, so fill it in if possible.

  • Step 4: Click ‘Calculate’

Once all the necessary fields are filled in, click the ‘Calculate’ button. The tool will then process the information and provide you with an estimated ovulation date.

  • Step 5: Review Your Fertile Window

The calculator will display your estimated fertile window, usually spanning six days. This is the best time for conception.

Ovulation Calculator

Final thoughts

Determining the fertile days is essential, whether you want to get pregnant or want to avoid it.

If you have an irregular menstrual cycle it is possible to specify your fertile days, but take time.

Go to your doctor to rule out and take care of health problems that may be affecting the regularity of your menstrual period. Your sexual and reproductive health will thank you.


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