Most of us got one period talk, one pamphlet, and thirty years of guessing. So here is the part nobody covered: your cycle is not just your period. It's four distinct phases, each running its own hormones, energy and mood, all month, every month. Your period is simply the phase that demands the most laundry.
Knowing the four stages of the menstrual cycle won't make day one glamorous. It'll make it predictable. And predictable means you can plan around your body instead of being ambushed by it. Here is what actually happens in each phase, what it tends to feel like, and the signs that mean your cycle deserves a doctor's appointment rather than a hot water bottle and a brave face.
The four phases of the menstrual cycle, at a glance
In a textbook 28-day cycle, the four phases of menstruation look like this:
- Menstrual phase: day 1 to about day 5. You bleed. The cycle starts here.
- Follicular phase: day 1 to about day 13. Your body preps an egg. It overlaps with your period.
- Ovulation: around day 14. An egg is released. The main event, biologically speaking.
- Luteal phase: about day 15 to 28. Your body waits to see what happens, then starts again.
One honesty note before we go phase by phase: almost nobody runs a textbook 28-day cycle. Anywhere from 21 to 35 days is considered a regular cycle. Your day 14 might be someone else's day 19. The order never changes; the timing is yours.
Phase 1: The menstrual phase (day 1 to about day 5)
Day one of bleeding is day one of your whole cycle. Oestrogen and progesterone drop, and the lining your uterus spent all month building (the endometrium) sheds and leaves through the vagina. That's your period: lining, blood and tissue, usually around 2 to 3 tablespoons across the whole thing, even when it feels like considerably more.
Energy is typically at its lowest point of the month here. Many people feel inward, tired and done with small talk. Cramps, back ache and heavy days tend to cluster in the first day or two. This is the phase to lower the bar: shorter to-do list, earlier nights, warmth on your stomach. A wheat bag manages about 20 minutes of that before it needs a microwave, which is worth knowing before day one, not during it.
Phase 2: The follicular phase (day 1 to about day 13)
The follicular phase technically starts the same day your period does and runs until ovulation. Your brain releases follicle stimulating hormone, which tells your ovaries to start ripening follicles, each holding an immature egg. One follicle wins, keeps growing, and produces rising oestrogen.
As the bleeding stops and oestrogen climbs, most people feel the shift: more energy, more focus, more patience for other humans. This is the week you say yes to things. Ideas feel achievable, workouts feel shorter, and you briefly become the person who reorganises the pantry before work. Enjoy it. It's hormonal, and it's also real.
Phase 3: Ovulation (around day 14)
Rising oestrogen triggers a surge of luteinising hormone, and the dominant follicle releases its egg. That's ovulation. The egg survives around 24 hours; this window, plus the few days before it, is when pregnancy is possible.
Plenty of people feel nothing at all. Others notice clearer skin, a higher sex drive, more confidence, or a distinct one-sided twinge called mittelschmerz, which is German for "your ovary would like a word". Some also notice extra discharge or light spotting, which is where a thin pair of leak-proof undies quietly earns its keep. If ovulation is reliably painful rather than noticeable, that's not a personality trait. Mention it to your doctor.
Phase 4: The luteal phase (about day 15 to 28)
After the egg is released, the empty follicle becomes a small temporary gland called the corpus luteum, which produces progesterone and some oestrogen. Together they keep the uterine lining thick in case a fertilised egg arrives. If it doesn't, the corpus luteum breaks down, both hormones fall, and the lining sheds. Congratulations: you're back at day one.
The back half of the luteal phase is where premenstrual symptoms live: bloating, tender breasts, breakouts, broken sleep, a shorter fuse, and strong opinions about how the dishwasher is stacked. Common doesn't mean ignorable. Mild symptoms are part of the hormonal comedown; symptoms that flatten you every single month are worth raising with a health professional, because there are real options and you're allowed to use them.
When your cycle is trying to tell you something
Every cycle is different, and yours only has to be normal for you. But some things are worth investigating rather than enduring: cycles consistently shorter than 21 days or longer than 35, bleeding through your best protection every hour or two, periods that regularly last longer than 8 days, cramps that painkillers and rest barely touch, or pain at other points of your cycle.
Jo, the owner of Scarlet, spent years being told her cycle was just bad luck. It was stage 4 endometriosis. In Australia, endometriosis takes on average around 6.5 to 8 years to diagnose (AIHW). That gap is made of people being told their pain is normal. If your gut says something is off, keep asking. Start with our plain-English guide to living with endometriosis, then book the appointment. And if you are pregnant or think you might be, anything cycle-related goes straight to your doctor first.
Matching your period care to your phase
Once you know the pattern, you can stock for it instead of scrambling.
Days 1 and 2, the loud days: heavier absorbency and warmth. Our period underwear is rated in tampon equivalents, so heavy pairs hold around 4 regular tampons' worth. For cramps, rae, our wearable heat pad, slips under your clothes and runs 5+ hours on low, around 3 on medium and around 2 on high. No cords, no microwave, no being pinned to the couch. It's comfort, not a medical device, and it's very good at its one job.
Days 3 to 5, the wind-down: lighter pairs, around 2 to 3 tampons' worth, or a period cup with up to 8 hours of leak-free wear. Curious how leak-proof undies actually hold that much? We wrote it up here: how period underwear works.
Ovulation and late luteal: super light pairs handle discharge, spotting and the just-in-case days, under 1 tampon's worth, without you thinking about it.
The short version
Menstrual, follicular, ovulation, luteal. Four phases, one loop, repeating for roughly four decades of your life. You don't need to track every hormone to benefit; even noting your start date and your worst symptoms for three months tells you (and your doctor) a remarkable amount. Your cycle has been sending you monthly reports for years. This is just learning to read them. If you want the exercise angle next, we covered working out around your menstrual cycle too.