First Rules: Your Personal Guide (Not the One for Your Mother)
You've discovered blood in your underwear, and suddenly a flood of questions arises. Is this normal? What should you do now, right away? Will it be noticeable?
Breathe. What's happening to you is completely normalIt happens to all girls, and you don't need anything extraordinary to deal with it. We're going to explain everything simply, without complicated jargon, and answer the real questions you're asking yourself, not just the theory you find everywhere.
👋 If you are a parent who stumbles upon this page
This article is written directly for your daughter, in simple, open language. You can give it to her as is, or read it together. A special section at the very end is dedicated to you, with practical suggestions to help you support her.
📌 Keep this handy
Your Summary Sheet
It's happened, now what?
If you're reading this because you just got your period, here are three simple steps to take in the next half hour. No need to rush around, just know what to do in the right order.
1. Put something in your underwear
A sanitary napkin, some folded toilet paper until you have something better, or period underwear if you have some on hand. The urgent thing is to have something absorbent.
2. Tell someone you trust
Your mother, your father, an older sister, the school nurse, a friend who already has her period. You don't have to deal with this all alone if you don't want to.
3. Note the date in your phone
Just the day it started. It will help you later to understand your own rhythm.
What exactly does your body do?
You don't need a whole biology course to understand the basics. Inside your belly is the uterus, a small organ shaped like an upside-down pear. Each month, it lines its walls with a thicker mucous membrane, a sort of cozy little nest, in case of pregnancy. If there isn't one, which is obviously the case for you, this nest is no longer needed. Your body sheds it, and it's this blood that comes out through the vagina. The following month, it builds a new nest, and so on. That's the menstrual cycle.
💬 The reassuring detail
What comes out of your body isn't just pure blood. It's a mixture of blood and the lining that formed that little nest. Over the course of your entire period, the total amount usually only exceeds two to three tablespoons. It often seems more impressive than it actually is.
Signs That Tell It's Approaching
Periods never arrive completely without warning. Your body sends signals several months, sometimes several years in advance, because puberty progresses in several stages, not all at the same time.
The breasts that are starting to grow
This is usually the very first visible sign, sometimes as early as 8 or 9 years old. Periods generally arrive 2 to 3 years after this onset, so if you're at this stage, you still have some time.
Hairs that appear
Under the arms and in the pubic area, hair grows gradually during this same period. You don't necessarily have to shave; it's entirely your choice.
White discharge in the underwear
Often the earliest sign. A few months before your first period, you might notice whitish or pale yellow spotting, without a strong odor. This is normal; it's your vagina starting to function like an adult's.
A growth spurt
You often grow faster just before your first period, then your growth slows down afterwards. This is a marker that doctors also use to estimate where you are in puberty.
Your cycle will be all over the place at the beginning, and that's normal.
This is probably the most important point in this whole article, the one that no one explains clearly enough. Your body has only just learned to do this new thing. Like riding a bike, there are bound to be times when it goes haywire before it runs smoothly.
This is perfectly normal in the first few years.
- Your period may return 3 weeks later, or you may have to wait almost 2 months. The interval between periods can vary between 21 and 45 days during the first two years, sometimes up to 3 years.
- The duration of bleeding can vary from month to month, sometimes 3 days, sometimes 7
- The flow can be very light one month and heavier the next.
- You can skip a whole month without a period, especially during stressful times, exams, or if you do a lot of sports.
Your body needs about one to two years to find its rhythm, and irregular cycles These periods are not a warning sign. During this time, the best thing you can do is note down each period start in an app or notebook, to begin identifying your own pattern, however imperfect.
⚠️ The only instance where you should speak to an adult or a doctor
If you truly haven't had a period for more than 3 months in a row after having one previously, if the bleeding lasts more than 7 days, or if you have to change your sanitary protection every hour because it's too heavy, it's not necessarily serious, but it's worth discussing it with a professional to understand what's going on.
Even before it happens, your body sends you signals.
A few days before their period starts, many girls experience physical or mood changes. This is called menstruation. premenstrual syndromeAnd it's not in your head or an excuse, it's related to the hormones that are moving just before.
- The swollen belly • a feeling of bloating, sometimes the impression of having gained weight when it is only water
- Sensitive breasts • more painful to the touch for a few days
- Mood swings · more irritable, more emotional, for no apparent reason
- Fatigue • a greater desire to sleep than usual
- Minor acne breakouts • often on the chin or forehead, just before the start of menstruation
These symptoms usually disappear once menstruation begins. If they become truly difficult to manage each month, talking to an adult or a doctor can help find solutions.
Tampons, Pads, Period Panties: Which to Choose
There's no single right answer; it depends on what makes you most comfortable. Here are some options to help you choose, especially for first-timers.
You can test several options and keep the one that suits you best; you are under no obligation to choose a single protection for your entire life.
Your Real Questions, Without Detours
The Small Bag to Prepare, Just in Case
Once your first period has passed, the easiest thing to do is always keep a small emergency kit in your school bag. That way, you'll never have to stress if it happens unexpectedly in the middle of class.
- One or two emergency protections · a thin pad, or a small emergency menstrual panty
- A spare pair of underwear · Just in case, it avoids panic if there's a small leak
- A small plastic bag or pouch · to discreetly store stained underwear without bothering anyone
- A mild pain reliever approved by your parents If you often get cramps, it's best to have it with you.
Protection Designed For Your First Period
Our Period Panties specifically designed for teens are designed to reassure without complicating, comfortable, discreet, and require no changes throughout the day.
If It Happens at School
- Ask to leave and go straight to the bathroom; you don't need to give the teacher any details if you don't want to.
- The school infirmary always has free sanitary products; you can go there without shame.
- If you have a stain on your pants, a sweater tied around the taille creates a perfect illusion while waiting to return
- A trusted friend can often help you check discreetly, or lend you protection.
It's Just a New Thing Your Body Knows How to Do
Getting your period isn't a scary event, even if the first few times inevitably feel a bit like navigating blindly. Your body is learning, your cycle will probably act up for a year or two, and that's exactly what you should expect, not an anomaly.
The more openly you talk about it, the less of a burden it becomes. Over time, you'll find your own rhythm, learn what soothes your pain, and choose the protection that works best for you. Keep this little kit in your bag, and remember that what you're going through is happening to millions of other girls around the world at the same time.
And most importantly, you're not in danger, you don't have to be ashamed, and you don't have to hide it like a terrible secret. It's just something that happens in your body, like it does to all other girls.
👋 For Parents, In Detail
If your daughter has just discovered this article, or if you've shown it to her beforehand, a simple conversation is often more helpful than a long, prepared speech. Ask her what she's already understood, gently correct what needs correcting, and especially emphasize the normal irregularity of the first two years; this is often the most underestimated source of anxiety at this age.
Having a small stock of various sanitary products at home avoids stress on the big day. And if the pain or bleeding seems to be truly out of the ordinary described above, a consultation with a doctor or gynecologist remains the best option to clear up any doubt.
Sources & References
This article is based on recommendations from recognized pediatric institutions.
- Harley KG, Watson A, Vitzthum VJ, Shea A, Robertson S. (2024). Menstrual Cycle Characteristics of US Adolescents According to Gynecologic Age and Age at Menarche. Journal of Pediatric and Adolescent Gynecology, a study covering 38,916 actual menstrual cycles of adolescent girls aged 13 to 18. PubMed: 38570085
- Menstrual Disorders in Adolescence, Diagnostic and Therapeutic Challenges. (2024). Journal of Clinical Medicine, systematic review of 1724 publications, confirming up to 85% of anovulatory cycles 2 years after the first period. DOI: 10.3390/jcm13247668
- Mansfield MJ, Emans SJ. (1984). Adolescent menstrual irregularity. Journal of Reproductive Medicine, historical reference establishing that 55% of cycles are anovulatory in the first year after menarche. PubMed: 6379175
- Time to Cycle Regularity and Health Risks. (2025). Review on the maturation of the hypothalamic-pituitary-ovarian axis during 1 to 2 years after menarche. PMC12459127
