You can figure out which phase of your menstrual cycle you’re in by tracking a few body signals: when your last period started, what your discharge looks like, how your energy feels, and (if you’re tracking) your morning temperature. A typical cycle runs 21 to 35 days, with four distinct phases that each come with recognizable physical changes.
The simplest starting point is counting. Day 1 is the first day of full bleeding. From there, each phase follows a roughly predictable timeline, though the exact length varies from person to person and even cycle to cycle.
The Four Phases at a Glance
Your cycle moves through four phases: menstrual, follicular, ovulation, and luteal. Each one is driven by shifting hormone levels, and those hormonal shifts produce physical signs you can learn to read. On a 28-day cycle, the phases break down roughly like this, though cycles anywhere from 21 to 35 days are considered normal.
- Menstrual phase (days 1 to 5): Active bleeding. Hormone levels are at their lowest.
- Follicular phase (days 1 to 13): Overlaps with menstruation and continues after bleeding stops. Estrogen climbs steadily.
- Ovulation (around day 14): An egg is released. Estrogen peaks, testosterone surges, and you get a brief fertile window.
- Luteal phase (days 15 to 28): Progesterone rises and then drops if no pregnancy occurs, triggering your next period.
Menstrual Phase: Bleeding and Low Energy
This one’s obvious. If you’re bleeding, you’re in the menstrual phase. Bleeding typically lasts 2 to 7 days. Both estrogen and progesterone are at their lowest point, which is why many people feel tired, achy, or low-mood during this window. Your cervix sits low, feels firm, and opens slightly to let blood pass through.
After bleeding stops, discharge is usually dry or tacky and white or slightly yellow. This dry window is your clearest signal that you’ve moved into the early follicular phase.
Follicular Phase: Rising Energy, Changing Discharge
The follicular phase technically starts on day 1 (it overlaps with menstruation), but you’ll notice its effects most after bleeding ends. Estrogen is climbing, and that rising estrogen drives several changes you can feel and see.
Cervical mucus follows a predictable pattern on a 28-day cycle. In the days right after your period (roughly days 4 to 6), discharge is sticky and slightly damp. By days 7 to 9, it becomes creamy and cloudy, with a yogurt-like consistency. As you approach ovulation (days 10 to 14), it turns clear, slippery, and stretchy, resembling raw egg whites. That egg-white mucus is your body’s clearest signal that ovulation is close.
Energy and mood typically improve through this phase. Estrogen supports a general sense of well-being, and many people notice they feel more social, motivated, and mentally sharp in the days leading up to ovulation. Your cervix gradually softens and rises higher in position as estrogen increases.
Ovulation: The Fertile Window
Ovulation happens when a surge of luteinizing hormone (LH) triggers the release of an egg from the ovary. That egg release typically occurs 24 to 36 hours after the LH surge. The egg itself is only viable for about 24 hours, which is why the actual fertile window is short.
Several signs cluster around ovulation. Testosterone peaks at this point in the cycle, which often shows up as a noticeable increase in sex drive. Your cervix reaches its highest position, feels very soft, and is at its most open. Cervical mucus is at its most slippery and stretchy. Some people feel a mild twinge or cramp on one side of the lower abdomen as the egg releases.
If you’re using ovulation test strips, they detect that LH surge in your urine. A positive result means ovulation is likely within the next day or two. If you’re tracking basal body temperature (your resting temperature first thing in the morning), you won’t see a change yet. The temperature shift comes after ovulation, not during it.
Luteal Phase: Temperature Rise and PMS
Once the egg is released, the structure it left behind on the ovary starts producing progesterone. This progesterone bump causes your basal body temperature to rise by about 0.5 to 1 degree Fahrenheit (0.3 to 0.6 degrees Celsius). If you’ve been charting your temperature daily, that sustained rise confirms ovulation already happened and places you in the luteal phase.
Discharge changes quickly after ovulation. The slippery, egg-white mucus dries up and becomes thicker, stickier, and less transparent. Your cervix firms up and drops back to a lower position. These shifts happen because progesterone is now the dominant hormone, and it essentially closes the cervical gateway.
The luteal phase lasts about 14 days for most people, and it’s where premenstrual symptoms live. As progesterone rises and then falls in the second half of this phase, you may notice bloating, breast tenderness, mood changes, food cravings, or fatigue. If progesterone drops enough without a pregnancy signal, the uterine lining sheds and your period begins again.
How to Track Your Phase Right Now
If you’re trying to figure out where you are today, start with these three questions:
- When did your last period start? Count forward from that day. If it was 5 days ago, you’re likely in the late menstrual or early follicular phase. If it was 20 days ago, you’re probably mid-luteal.
- What does your discharge look like? Dry or tacky means early follicular. Creamy means mid-follicular. Clear and stretchy like egg whites means you’re approaching or at ovulation. Thick and sticky again means luteal.
- How do you feel? Low energy with bleeding places you in the menstrual phase. Rising energy and mood suggest follicular. A spike in sex drive points to ovulation. Bloating, breast soreness, or irritability suggest the second half of the luteal phase.
For ongoing tracking, a combination of methods gives the most reliable picture. Checking cervical mucus daily is free and surprisingly accurate once you learn your own pattern. Adding basal body temperature tracking (using a thermometer accurate to one decimal place, taken before getting out of bed) confirms ovulation after the fact. Period-tracking apps can help you log all of this and predict future phases based on your personal data.
When Your Cycle Doesn’t Follow the Pattern
Not everyone moves through all four phases every cycle. Sometimes the body skips ovulation entirely, a situation called an anovulatory cycle. Without ovulation, you don’t get a true luteal phase, and the “period” that follows may be lighter or heavier than usual.
Signs that ovulation may not be happening include: periods that come less than 21 days or more than 35 days apart, cycle lengths that vary significantly from month to month, very heavy bleeding (more than about 80 mL per cycle, or soaking through a pad or tampon every hour), very light bleeding, or the absence of egg-white cervical mucus at any point in your cycle. Missing that stretchy, clear mucus is one of the most practical clues that ovulation didn’t occur.
Occasional anovulatory cycles are common during puberty, perimenopause, and times of high stress or significant weight change. If it’s happening regularly, it may point to conditions like polycystic ovary syndrome or thyroid imbalances that affect hormone signaling.