Menstrual Cycle Explained: Phases, Fertile Window & Luteal Phase Symptoms

If you’re trying for a baby, understanding your menstrual cycle is one of the most powerful tools you have. Your body gives clear signs about when you’re fertile, but you need to know what to look for, so here is the Menstrual Cycle Explained, in clear defined sections.

After 15 years of helping hundreds of couples conceive, I’ve learned that there is no single “normal” cycle — but there are patterns, hormonal shifts, and physical changes that can help you pinpoint your fertile window and improve your chances of conception.

The Phases of Your Menstrual Cycle

Most menstrual cycles last between 21–35 days. In this guide, we’ll use the classic 28-day cycle to explain what happens in each phase and how you might feel.

Menstrual Phase (Days 1–5)

Day 1 is the first day of bright red bleeding. Your uterine lining sheds, and oestrogen and progesterone levels are at their lowest.

How you might feel: Low energy, possibly more emotional, and physically drained. Rest and gentle self-care are important here.

Fertility tip: This isn’t your fertile window, but it’s a good time to start tracking your cycle and noting symptoms.

Follicular Phase (Days 1–13)

Your brain sends Follicle Stimulating Hormone (FSH) to your ovaries, encouraging several eggs to start maturing. Usually, one will fully mature, sending a signal to the others to step back.

Oestrogen rises during this time, helping to thicken the uterine lining and support egg development.

How you might feel: More upbeat, sociable, and energetic — oestrogen is the life and soul of the party!

Fertility tip: This is the time to start increasing hydration and nourishing your body with nutrient-rich foods to prepare for ovulation.

Ovulatory Phase (Around Day 14)

A surge in Luteinizing Hormone (LH) triggers the release of a mature egg from the ovary into the fallopian tube. This is your peak fertile window.

Cervical mucus changes to a clear, stretchy “egg white” texture, which helps keep sperm alive for up to 5 days.

How you might feel: Increased sex drive, heightened energy, and sometimes a light twinge on one side of your lower abdomen (ovulation pain).

Fertility tip: Have sperm waiting for the egg — start trying a few days before ovulation, or even better – throughout your entire cycle. Drink at least 2 litres of water a day to support high-quality cervical mucus.

Luteal Phase (Days 15–28)

After ovulation, the empty follicle forms the corpus luteum, which releases progesterone. This hormone prepares the uterine lining for a possible pregnancy and supports an embryo until the placenta takes over.

If pregnancy doesn’t occur, progesterone levels drop and a new cycle begins.

How you might feel: Calmer and more level-headed. This is a good time for reflection and making thoughtful decisions. If progesterone is low, you might experience PMS symptoms or an early period.

Fertility tip: Focus on sleep, stress management, and steady blood sugar. Avoid strict fasting in this phase — progesterone thrives with steady, healthy carbohydrate intake.

Luteal Phase Symptoms: Common symptoms

Common luteal phase symptoms can include:

• Breast tenderness
• Bloating
• Mild cramping
• Fatigue
• Mood changes
• Increased appetite
• Constipation

These symptoms are caused by rising progesterone after ovulation. If progesterone levels are low, you may notice spotting before your period or a luteal phase shorter than 12 days.
If symptoms are severe or your luteal phase is consistently short, it may be worth exploring hormonal support.

When Hormones Are Out of Balance

If your cycle is irregular, very short after ovulation, or you have symptoms like severe PMS, mood swings, poor sleep, or no fertile cervical mucus, your hormones may need support.

Signs of Hormonal Imbalance

• Ovulation happening very late or not at all
• Luteal phase shorter than 12 days
• Little or no egg-white cervical mucus
• Fatigue and low mood
• Irregular or missed periods

Natural Ways to Support Hormone Balance

1. Diet & Nutrition

   • Eat plenty of whole foods, healthy fats (avocado, nuts, olive oil), and lean proteins.
   • Include complex carbohydrates (sweet potatoes, quinoa, brown rice) in your luteal phase.
   • Reduce processed sugar to help stabilise insulin and hormone levels.

2. Exercise

   • Gentle movement like walking, yoga, or Pilates supports hormone health.
   • Avoid excessive high-intensity workouts if your cycle is irregular — it can disrupt ovulation.

3. Reflexology

   • Fertility reflexology can help support hormonal balance, reduce stress, and improve cycle regularity by stimulating specific pressure points on the feet.

4. Acupuncture

   • Shown to improve blood flow to the reproductive organs, regulate cycles, and reduce stress hormones that interfere with fertility.

Final Thought

Your cycle is your body’s monthly report card. By learning to read its signs and supporting it naturally, you can improve your fertility and feel more in control of your trying-to-conceive journey.

If you need personalised support, our fertility coaching sessions provide tailored advice to help you optimise your cycles, boost your hormone health, and increase your chances of conceiving.