How to calculate your menstrual cycle?

Are you the type to know your menstrual cycle by heart? Or rather to worry about the date of your last period like it's ancient history? If so, don't worry: you're not alone. Calculating your menstrual cycle can be a real guessing game for some, and an exact science for others. Simply because there are a multitude of different realities. So if you're feeling a bit lost and want to find your way without overthinking it... look no further! This article is here to help you. So, how do you calculate your menstrual cycle? We'll explain the basics of the female cycle and give you our best tips for easily learning to anticipate it.

Understanding the menstrual cycle: the basics

What is the menstrual cycle?

The menstrual cycle is a natural process that occurs in a woman's body every month. It's quite useful, as it prepares the body for a possible pregnancy! It begins on the 1st day of menstruation and ends just before the next period. How does it work? Well, it involves hormonal variations that affect the uterus and ovaries, and which, consequently, lead to ovulation.

A "normal" cycle: myth or reality?

We often talk about a "normal" menstrual cycle. However, it varies considerably from one woman to another. A young girl may potentially have irregular periods, while an adult woman may be more accustomed to a regular cycle. And even then! In truth, "normality" here depends on several factors:

• general health status;
• medical conditions;
• stress.

And in this case, understanding that normality also encompasses these factors can help reduce a form of anxiety surrounding the subject.

Average duration of a menstrual cycle: key figures

Studies show that the average duration of a menstrual cycle is approximately 28 days [1]. However, we repeat (it's never too much): this can vary greatly from one woman to another, and last between 21 and 35 days [1]. A large study of over 600,000 cycles also showed that only 12 to 15% of women actually have an exact 28-day cycle [2].

The ovulation phase generally occurs around the middle of the cycle. Be careful, however, of a very common misconception: the famous "14th day" is only a reliable benchmark for an exact 28-day cycle. For a shorter or longer cycle, ovulation shifts accordingly — for example, towards the 10th day for a 24-day cycle, or towards the 21st day for a 35-day cycle [2]. Keep in mind that these figures are primarily averages, and that each woman can experience her own rhythm, with perfectly normal variations in terms of duration and regularity.

The phases of the cycle and their importance

The menstrual cycle consists of several phases, and each plays an essential role in preparing the female body for a potential pregnancy.

The follicular phase

The first is the follicular phase. This begins on the 1st day of menstruation and ends at ovulation. During this period, hormones stimulate the growth of several follicles in the ovaries, each containing an egg. One of these follicles will then become "dominant" and thus ready for ovulation. This phase remains crucial for preparing the body for pregnancy, as it influences the thickness of the endometrium, so that it can receive a fertilized egg.

Ovulation

The ovulation period (or fertility period) is somewhat the climax of the menstrual cycle. The dominant follicle releases the egg, which begins its journey to the uterus via the fallopian tube. The body triggers this event with a surge of luteinizing hormone (LH). With a little luck, the egg will meet a sperm for fertilization. This phase corresponds to the fertile window of the cycle: it indicates the time when you are most likely to become pregnant.

The luteal phase

Finally, after ovulation comes the luteal phase. This last stage of the cycle marks the moment when the empty follicle transforms into a corpus luteum, then secretes hormones to maintain the thickness of the endometrium. And if the egg is not fertilized, the corpus luteum disintegrates: hormone levels drop, and the next period begins! This phase, often marked by premenstrual syndrome, serves to:

• stabilize the cycle;
• prepare the body to start a new one;
• or support a new pregnancy.

Understanding these three phases will help you better understand your cycle and the important role it plays in female reproduction.

Cycle tracking: methods and tools

Tracking your menstrual cycle remains essential for understanding and managing your reproductive health. It will allow you to better know yourself, predict your fertile periods, and identify your irregularities.

The menstrual calendar: why and how to keep it?

Many women use a menstrual calendar to help them track:

• the start and end of their cycles;
• the duration of their menstruation;
• their premenstrual syndrome.

Practical, therefore, for anticipating your fertile period. It's simple: you mark the 1st day of your last period as the beginning of the cycle, and you continue until the beginning of the next period!

Calculating and predicting your cycle

How do you calculate the arrival of your next period? Well, simply by noting the duration between each menstruation to identify your personal "average". We highly recommend it if you are trying to conceive a baby, or to avoid pregnancy: you will more easily predict the arrival of your period and your ovulation cycle. The more familiar you become with your own cycle, the better you will be able to detect any unusual changes!

Modern tools for tracking your cycle

Today, many digital tools exist to help you track your cycle. You'll find plenty of mobile menstrual calendar applications that offer interesting features such as:

• prediction of fertile periods;
• calculation of periods;
• a pregnancy calendar, if needed.

You just have to enter your data over time to customize your tracking. Practical!

In any case, whether you're team pen-and-paper or team App Store: calculating your menstrual cycles remains very useful for learning about yourself and managing your life as a woman as best as possible.

Understanding body signals

Of course, the hormonal changes of the female cycle influence your fertility. But that's not all! They also play a major role in your overall well-being, as well as your emotional and physical state. Understanding your body's signals then becomes essential for managing these variations.

Revealing signs of ovulation

The same signs of ovulation are often observed:

• slight increase in your body temperature curve;
• more fluid and transparent consistency of cervical mucus;
• (sometimes) slight uterine contractions.

These indicators, which are the basis of the method called symptothermal, can help you identify your fertile window. Learning to recognize them will help you a lot if you wish to conceive a baby, or avoid becoming pregnant. However, the symptothermal method requires a period of adaptation before it can be fully utilized: it often takes 3 to 6 cycles to effectively identify the different phases of the cycle. This method requires a good knowledge of one's body and a certain rigor in the analysis of temperature and cervical mucus.

Symptoms associated with periods

Every woman experiences different premenstrual syndromes before the onset of menstruation. But the most common are:

• cramps;
• bloating;
• mood changes;
• cravings for specific foods.

These signals reflect the hormonal changes that prepare the body for menstruation. Their intensity differs greatly from woman to woman: they can be mild for some, and very debilitating for others.

Impact of the cycle on physical and emotional feelings

The different phases of the menstrual cycle also influence your emotional and physical well-being. It is observed that hormonal variations can:

• cause mood swings;
• affect energy and libido;
• alter self-perception.

For example, the phase just before the next period can induce irritability and fatigue. The post-menstrual period, on the other hand, can be characterized by a surge of energy and a strong dose of optimism. Thus, recognizing these variations can help you manage them more effectively, and consequently, allow you to establish a better emotional and physical balance in your life.

Frequently asked questions about the menstrual cycle

Managing an irregular cycle

We agree: calculating the arrival of your next period when you have irregular cycles can be a real hassle. But there are plenty of solutions to relieve you. You can start by consulting a healthcare professional to rule out certain underlying conditions (PCOS, also called SMOP, thyroid disorder...). Sometimes, improving the regularity of your cycle also involves a lifestyle change, such as:

• adjusting your diet;
• getting some regular exercise;
• reducing your stress.

So go talk to your gynecologist or midwife, they will be able to give you good advice.

Ovulating twice in one month: is it possible?

A double ovulation in a menstrual cycle remains extremely rare. Nevertheless, it is possible to release more than one egg within 24 hours during the same ovulation period. This can lead, in some cases, to multiple pregnancies.

Pregnancy and cycle: changes

Unsurprisingly, pregnancy periods cause significant changes in the cycle. Starting with the cessation of periods for nine months, due to hormonal changes related to gestation and fetal development. After childbirth, you may observe variations in the duration and intensity of your first periods. This is normal; it takes time for the body to return to its usual rhythm.

Is the 14th day really the day of ovulation for all women?

No, this is a very common misconception. The 14th day is only a valid benchmark for an exactly 28-day cycle, and only a minority of women actually have a cycle of this exact duration. To know your own rhythm, it's better to observe your body's signs (temperature, cervical mucus) over several cycles rather than relying on a fixed date.

So, what can we take away from all this? Well, that understanding your menstrual cycle remains an essential key to taking care of your reproductive health. Each phase brings with it its share of signals (and challenges). But with the right information and the best tools, you'll have all the cards in hand to better manage your cycle, or know your ovulation period like the back of your hand. And consequently, improve your quality of life!

This article is for informational purposes only and does not constitute medical advice. Consult your doctor or midwife for personalized advice regarding your cycle.