Understanding Your Menstrual Cycle
A friendly guide to what's really happening in your body each month
By Albury Compounding Pharmacy
Your menstrual cycle is far more than just your period. It's a complex, beautifully orchestrated process involving your brain, hormones and reproductive system working together throughout the month. Yet many women go through years — even decades — of cycles without really understanding what's happening or why.
This guide will help you make sense of your cycle, from the first day of your period through to the next. You'll learn what's normal, what each phase feels like, and when changes might warrant a chat with your doctor. No medical background needed — just bring your curiosity.
Understanding your cycle isn't just interesting; it's empowering. It can help you make sense of mood shifts, energy changes, and physical symptoms that might have seemed random before.
What Is a Menstrual Cycle?
Your menstrual cycle is the monthly process that prepares your body for a possible pregnancy. If pregnancy doesn't occur, the cycle resets and begins again.
The basics
A "normal" cycle can be anywhere from 21 to 35 days long (measured from the first day of one period to the first day of the next)
Your period (menstruation) is just one part of the cycle — it's actually the end of one cycle and the beginning of the next
The cycle has four main phases, each with distinct hormonal patterns and physical changes
Most women's cycles vary slightly month to month — this is completely normal
Your cycle is controlled by a conversation between your brain (specifically the hypothalamus and pituitary gland) and your ovaries. They communicate using hormones, sending signals back and forth to coordinate each phase.
The Four Phases of Your Cycle
Let's walk through what happens in each phase, what you might notice, and what your hormones are doing behind the scenes.
Phase 1: Menstruation (Days 1–5)
This is your period — the most visible part of your cycle. Day 1 is the first day of full menstrual flow (not just spotting).
What's happening?
The lining of your uterus (endometrium), which built up during the previous cycle, is shed because pregnancy didn't occur
Both oestrogen and progesterone are at their lowest levels
Your brain starts releasing hormones to prepare for the next cycle
What you might notice
Bleeding that's typically heavier in the first 1–2 days, then lighter
Cramping or period pain (usually strongest on day 1 or 2)
Fatigue or low energy
Lower mood or feeling more introverted
How long does it last?
Most periods last 3–7 days. Anything within this range is normal, as long as it's consistent for you.
Phase 2: The Follicular Phase (Days 1–13)
This phase actually overlaps with menstruation — it starts on day 1 of your period and continues until ovulation. During this time, your ovaries are preparing to release an egg.
What's happening?
Your pituitary gland releases a hormone called FSH (follicle-stimulating hormone), which signals several follicles (tiny sacs containing immature eggs) in your ovaries to start developing
Usually, one follicle becomes dominant and continues to mature
As the follicle grows, it produces increasing amounts of oestrogen
The rising oestrogen thickens the lining of your uterus, preparing it for a potential pregnancy
Your cervix produces fertile-quality mucus (clear, stretchy, egg-white-like) to help sperm survive
What you might notice
Energy levels gradually increasing
Feeling more outgoing, positive or confident
Clearer skin
Increased libido (sex drive)
Vaginal discharge that becomes clearer and more slippery as ovulation approaches
This is often when women feel their best — physically and mentally.
Phase 3: Ovulation (Around Day 14)
Ovulation is the main event of your cycle: the release of a mature egg from the ovary. It's a brief phase, lasting only 12–24 hours, though the fertile window (when pregnancy is possible) extends a few days before and after.
What's happening?
Oestrogen peaks, triggering a surge in LH (luteinising hormone) from the pituitary gland
This LH surge causes the dominant follicle to rupture and release its egg
The egg travels down the fallopian tube, where it may meet sperm if intercourse has occurred
If the egg isn't fertilised within 12–24 hours, it disintegrates
What you might notice
A slight increase in body temperature (useful if you're tracking ovulation)
Very clear, stretchy cervical mucus
Mild pelvic pain or a twinge on one side (called "mittelschmerz" or ovulation pain)
Peak energy and mood
Heightened libido
Not all women notice obvious signs of ovulation, and that's perfectly fine.
Phase 4: The Luteal Phase (Days 15–28)
After ovulation, your body shifts gears. This phase lasts about 14 days and ends when your next period begins.
What's happening?
The empty follicle (now called the corpus luteum) starts producing large amounts of progesterone and some oestrogen
Progesterone keeps the uterine lining thick and nourished, ready to support a pregnancy
If pregnancy occurs, the embryo implants into the uterine lining and starts producing hCG (the hormone detected by pregnancy tests), which keeps progesterone levels high
If pregnancy doesn't occur, the corpus luteum breaks down, progesterone and oestrogen levels plummet, and the uterine lining begins to shed (triggering your period)
What you might notice
Body temperature remains slightly elevated (a sign progesterone is present)
Energy may dip in the second half of this phase
Mood changes, particularly in the week before your period
Breast tenderness or swelling
Bloating
Food cravings
Changes in sleep
Skin breakouts
PMS symptoms (if you're prone to them)
The drop in progesterone just before your period can affect serotonin and other brain chemicals, which is why mood and energy often dip in the days leading up to menstruation.
Key Hormones at a Glance
Understanding the hormones at play makes the whole cycle easier to grasp:
Oestrogen
Rises during the follicular phase and peaks just before ovulation
Thickens the uterine lining
Associated with increased energy, mood and libido
Progesterone
Rises after ovulation during the luteal phase
Maintains the uterine lining
Has a calming effect but can cause fatigue or mood shifts when it drops
Slightly raises body temperature
FSH (Follicle-Stimulating Hormone)
Stimulates follicle development in the ovaries
LH (Luteinising Hormone)
Triggers ovulation
What's "Normal" and What's Not?
Every woman's cycle is unique, but here are some general guidelines:
Normal variations
Cycle length: 21–35 days
Period length: 3–7 days
Blood loss: 30–80 mL per period (roughly 6–16 soaked regular tampons or pads)
Mild cramping, particularly in the first 1–2 days
Some mood or energy fluctuations
Cycles that vary by a few days each month
When to see a doctor
Periods that are consistently shorter than 21 days or longer than 35 days
Bleeding that lasts longer than 7 days
Very heavy bleeding (soaking through a pad or tampon every 1–2 hours, or passing large clots)
Severe pain that interferes with daily activities
Bleeding between periods or after sex
Periods that suddenly stop (if you're not pregnant or approaching menopause)
Significant mood disturbances that affect your quality of life (possible PMDD)
Difficulty conceiving after 12 months of trying
These symptoms can indicate conditions like PCOS, endometriosis, fibroids, or hormonal imbalances — all of which are manageable with the right support.
Tracking Your Cycle
One of the best ways to understand your body is to track your cycle for a few months. You might notice patterns you hadn't spotted before.
What to track
First day of your period
Length of your period
Flow (light, moderate, heavy)
Physical symptoms (cramps, headaches, breast tenderness)
Mood and energy levels
Cervical mucus changes (if you're interested in fertility awareness)
There are many apps available to make this easy, or you can simply use a calendar or journal.
Tracking helps you predict your period, understand your body's rhythms, and provides useful information if you need to see a doctor.
Looking After Your Cycle Health
While your cycle is largely driven by hormones, lifestyle factors can influence how you feel throughout the month.
General cycle support
Regular exercise — helps regulate hormones, reduce cramps and improve mood
Balanced nutrition — adequate iron (especially if periods are heavy), omega-3 fats, and plenty of vegetables
Stress management — chronic stress can disrupt cycles
Good sleep — supports hormone balance
Staying hydrated — particularly during your period
If you're experiencing persistent cycle problems, your GP may suggest treatments ranging from lifestyle changes to hormonal therapies, depending on your individual situation.
When Personalised Treatment Can Help
For some women, standard treatments don't quite fit. This is where compounded medicines can be useful, offering:
Custom hormone doses for specific needs
Alternative delivery methods (creams, capsules, pessaries)
Formulations without certain fillers or allergens
Combination therapies tailored by your prescriber
These are always prescribed by a doctor and prepared by a specialist compounding pharmacy.
Final Thoughts
Your menstrual cycle is a vital sign of your overall health. Understanding what's happening each month helps you recognise what's normal for you, identify when something might need attention, and feel more connected to your body.
Remember: cycle symptoms that disrupt your life aren't something you need to endure. Whether it's heavy periods, severe pain, or mood changes that affect your wellbeing, help is available. You deserve to feel good throughout your cycle, not just on the "good" days.
References
Jean Hailes for Women's Health – "The menstrual cycle"; "Period pain"; "PMS and PMDD".
Leading Australian organisation for evidence-based women's health education.
RACGP – The Royal Australian College of General Practitioners
"Menstrual disorders and management"; "Heavy menstrual bleeding".
Clinical guidelines used by Australian GPs.
The Royal Women's Hospital, Melbourne – "Menstrual cycle fact sheets"; "Understanding your period".
Trusted Australian hospital resource.
Endocrine Society of Australia – "Reproductive hormones and the menstrual cycle".
Australian College of Midwives – Educational resources on menstrual health and cycle awareness.
NHMRC (National Health and Medical Research Council) – Guidelines on menstrual health and disorders.
World Health Organization (WHO) – "Sexual and reproductive health: menstrual health".