Calculating fertile days can be helpful in increasing the chances of getting pregnant. The fertility calculator or fertility calendar is one of the widespread methods for calculating the fertile days of the woman.

Do you want to know your fertile days to get pregnant? In this article, we explain what is and how an ovulation calculator work. What are the most reliable alternative methods that help you calculate your fertile period to facilitate fertilization?

Currently, technology has advanced a lot, the so-called apps have come to replace many physical and virtual channels. There are applications for almost everything, including the calculation of your fertile days.

Many of these have helped in different ways in everyday life, mainly women. Hundreds of apps have been designed to be very careful with your menstrual period. Although you should not rely 100% on these systems, they can be used as a valuable guide.

However, for women, it will not be difficult to calculate the fertile days. In this case, technology will help us to control ovulation and fertility. One quality of period cycle calculator is that it also allows you to make a medical report. Is awesome!

As we have said before, there are currently many technological advances. From the microscope that motorizes ovulation through saliva, to calculators or ovulation tests. All this can be done from the comfort of home and by ourselves.

What is the menstrual cycle?

Many of the women do not have complete information about their menstrual cycle and many times, they wait to be mothers (or to try it) to begin to know it. A woman begins to menstruate when she has reached puberty. From that moment on, she has the ability to get pregnant, so it is important to know the following.

It is the set of mechanisms that prepare the ovary to produce ovulation and a probable pregnancy. This process is carried out under the control of the hypothalamus and pituitary, in this case, we speak of an axis, the hypothalamic-pituitary-ovary axis.

This process is controlled by two hormones: follicle-stimulating hormone or FSH and luteinizing hormone or LH. The menstrual cycle in its entirety usually lasts between 21 and 35 days and is divided into three phases.

The follicular phase

The first day of menstruation begins. Here, FSH stimulates the growth of several follicles, but only one of them will mature and is called the dominant follicle and will be the one that will produce and release an egg. This follicle produces estrogen to prepare the endometrium and to make changes in the cervical mucus and promote the rise of sperm.

The ovular phase

In this phase, the LH level increases to its maximum level, the ovule ends, the follicle is broken and finally, the ovule will be released in order to be fertilized. In a 28-day cycle, this may occur between day 12 and 14 thereof.

The luteal phase

This phase begins immediately after ovulation. The follicle that released the ovule undergoes a transformation process, becoming the corpus luteum, which produces a hormone called progesterone. This hormone is conditioning the uterus to nest or implant the embryo.

If there was no fertilization, then the endometrium will flake off and between the 28th and 30th day of the cycle, menstruation will occur. In the luteal phase is when premenstrual syndrome occurs.

How to calculate the first day of the menstrual cycle

Normally, the rule comes every 21-35 days to adult women and every 21-45 days in adolescents. It begins to count from the first day of menstruation until the first day of the next.

The menstrual cycle is linked to the constant oscillation of estrogen levels, especially in the follicular phase, as we have told you before.

In the ovulatory phase, the ovum reaches the fallopian tubes, this phase is the ideal time to get pregnant. If the egg is not fertilized in this period, the levels of progesterone and estrogen sink. Therefore, the uterus loses its lining during this last luteal phase.

Once you have clear the phases of the cycle, you can start making decisions that have to do with your health or your family planning.

To know what is the first approximate day of your menstruation, and, consequently, to know how long the cycle will last, you should start counting what the first day of the cycle is and calculate how many days separate it until the beginning of the next cycle.

The first day of your ovarian cycle corresponds exactly to the first day of your menstruation, therefore, write it down so you can remember it. The period in which it bleeds lasts, as a general rule, between 3 and 5 days, but it can vary depending on each case.

On the seventh day of menstruation, the vaginal bleeding should have ended and the ovary would begin its process of forming the preovulatory follicles. This is the main cause of the increase in estrogen that usually takes place between the fourth and seventh day.

What are the usual values?

Many of the adult women have a menstrual cycle every 28 days, as a general rule, that is, this is the difference of days between one cycle and another. However, menstruation can be lengthened or shortened by 21 days to 35 days.

As this may vary, it is important that you record, at least for three consecutive cycles, how often your menstruation comes. On the other hand, if you are taking the contraceptive pill, as a general rule, the cycle should always be 28 days, since the treatment includes 21 contraceptive pills and 7 placebos.

If, on the other hand, you are taking hormonal treatment, the cycles tend to come less frequently. While you stay in the ranges mentioned above, you should not have any problems with your menstruation, but never stop making periodic visits to your specialist to advise you with greater certainty.



What is Fertility Calculator?

Fertility calculators are based on the rhythm method, or Ogino-Knaus method, a technique for birth control developed by the Japanese gynecologist Kyusaku Ogino and perfected by the Austrian doctor Hermann Knaus in the first decades of the last century.

The calculation of fertile days through a fertility calculator is an option that, for some women, could be valid. However, it does not represent a reliable method, since every woman has different menstrual periods.

The reason for the low reliability of these calculators that you can find online depends on that they are based on an approximate calculation that may be valid for you, but inaccurate for another woman.

There are many applications available online – almost with the same methods and functions. To use a menstrual cycle calculator, indicate which the first day of your last menstruation was and how many days usually last, both your cycles and your bleeds.

How does a fertility calendar work?

Usually, to calculate the most fertile days this type of calendar is based on regular periods. Since in women, the period of maximum fertility coincides with ovulation.

The calendar takes into account the approximate calculation of these days that usually coincide with the 6-7 central days of the menstrual cycle.

If, for example, you have a regular period that lasts 28 days, your most fertile days will be 6-7 central days from the middle of your period. That is to say, the 14th day plus the three previous days and the three following days.

This is the calculation you can do quickly with one of the woman’s fertile day calendars. You will only have to indicate the first day of your last menstruation and the duration of your cycle to obtain your fertility calendar with the days of ovulation. For instance, the best days to have sex if you want to get pregnant. Some calculators or calendars even tell you the approximate date of your child’s birth!

So far everything seems to be correct, but what if your menstrual cycles are not regular or if, despite having relationships during the ovulation phase, you have been trying pregnancy for many months without success?

How to calculate your fertile days if you have irregular periods?

Making it clear that a fertility calculator is a reliable tool to know the most fertile days of a woman (even with a regular period). However, there are other methods and more precise solutions, indicated both for women with regular cycles and with irregular periods.

  1. The ovulation test

For women with late ovulation or with short cycles of less than 25 days who wish to become pregnant, a more secure method of defining fertile days consists of the ovulation test that can be purchased in pharmacies.

If this is your case, fertility calculators can give you erroneous results, since the ovulation phase usually falls behind regular cycles.

  1. Basal Body Temperature Measurement

You may have heard about basal temperature as a method to detect fertile days and increase the chances of pregnancy. Indeed, during the menstrual cycle, the body temperature varies and increases significantly during ovulation.

To calculate your fertile days, in this case, you will have to measure your body temperature when you wake up before getting out of bed and register it every day to detect the increase.

  1. Calculations via Symptoms’ Control

Another way to know the most fertile days if your ovulation is late is to look at the typical symptoms of ovulation:

These methods are also valid for calculating the fertile period in women with regular menstruation.

In any case, it is advisable to always keep a check on the menstrual period because the irregularities could be the cause or the consequence of other problems such as, for example, the difficulty to get the pregnancy.

The periodic controls with your gynecologist will allow you to detect with time and find a way to solve:

Moreover, the probability of pregnancy on fertile days is greater because, in the ovulation phase of the cycle, the ovule is ready to be fertilized. However, it is not always easy to define which are the most fertile days and sometimes, even after testing and monitoring the cycle itself, many women do not achieve pregnancy.

In these cases, it is advisable to go to your gynecologist for some initial exams and define the guidelines to find the best solution. Next, we answer some frequent concerns about female fertility and how to calculate fertile days:

What are the woman’s fertile days?

The fertile period of a woman coincides with the ovulation phase, which occurs with the rupture of the follicle and the release of the ovule. This phase in a regular menstrual cycle is recorded in the middle of the period (days 13 to 15).

Ovulation is preceded by the follicular phase (growth of the follicle) and is followed by the luteal phase (production of hormones that favor implantation if fertilization is carried out). Normally, the luteal phase lasts 12-14 days, but in irregular cycles, it can vary – making it difficult to calculate the fertile days of a woman.



What is the day of ovulation?

It is a phase of a woman’s menstrual cycle. It consists of the release of the ovule that has matured in the ovary. This event characterizes the fertile period in women.


How to know if you are ovulating?

If your menstrual cycle is regular, you can use a fertility calculator to know approximately the ovulation phase of your cycle. Are your periods not regular? You can try other methods such as the ovulation test, the measurement of the basal temperature or monitor the typical symptoms of ovulation.

If you have doubts or have difficulty getting pregnant, your gynecologist will know how to tell you the tests to detect your most fertile days and possible treatments.

What are your most fertile days?

The most fertile days coincide with the ovulation phase, which is when the ovule is mature and ready to be fertilized. In a regular cycle, this phase coincides with the central 6-7 days of the period.

What are your infertile days?

In theory, menstruation marks the least fertile days for women. At this time, the body gets rid of the unfertilized egg and the chances of getting pregnant are minimal. However, calling them “infertile” is not entirely correct because there are cases in which the woman ovulates twice. Although it is true that at this time of the cycle, you are less fertile, there are chances of getting pregnant.

Can you get pregnant on non-fertile days?

The answer is yes and it depends on many factors. The probabilities exist because of the difficulty of establishing exactly the phase of beginning and end of ovulation (especially if your cycle is irregular) with natural techniques and because the sperm can survive some days in the uterus. So, if you want to avoid pregnancy, using fertility calculators is not recommended. Contraceptive methods are the safest way, also on the least fertile cycle days.

How do you know you are fertile?

Nowadays, the scientific advancement in the assisted reproduction sector has developed many fertility tests that you can acquire without medical prescription and do yourself at home. In some cases, you will need to perform some fertility tests that your gynecologist will recommend.

Faced with a possible case of infertility, a specialist will assess all possible factors with male and female fertility test to detect the causes of infertility of the couple.

When to resort to fertility treatments?

In the United States, in recent years, an infertility rate between 10 and 12% has been recorded. It is a factor that interests both women and men and a sector in which science continues to investigate to offer the best solutions.

The American Society for Reproductive Medicine promotes studies on fertility and a reference for the Administration and entities that require advice on reproductive health issues.

The causes of infertility in women can be many and, therefore, the diagnosis is the first step towards the ideal treatment. Thanks to menstrual cycle calculator and fertility calculator, as well as other methods, you can calculate your mensuration and fertility.