Your menstrual cycle has four phases, and you can figure out which one you’re in right now by counting the days since your last period started and paying attention to a few body signals. Day 1 is always the first day of bleeding. A typical cycle runs 24 to 38 days from that starting point to the day before your next period begins.
Here’s how each phase breaks down, what’s happening in your body, and the clues that tell you where you are.
The Menstrual Phase (Days 1 to ~5)
If you’re bleeding, you’re in the menstrual phase. This is the simplest one to identify. It starts on the first day of your period and typically lasts three to seven days. During this phase, estrogen and progesterone are both at their lowest levels. Because those hormones have dropped, the thickened lining of your uterus has nothing telling it to stay put, so it sheds. That shedding is your period.
You may feel cramping, fatigue, or lower back pain. Energy levels tend to be at their lowest point in the cycle. Once bleeding tapers off, your body is already transitioning into the next phase.
The Follicular Phase (Days 1 to ~13)
The follicular phase actually overlaps with your period because it starts on Day 1 too, but it extends well beyond the days you’re bleeding. During this stretch, your brain sends a signal to your ovaries to start preparing an egg. Several tiny fluid-filled sacs (follicles) begin developing, and eventually one becomes dominant.
The key hormone here is estrogen, which starts low and climbs steadily. You can feel this shift. Many people notice their mood lifting, energy increasing, and skin clearing as estrogen rises through the follicular phase. Cervical mucus offers a reliable physical clue to where you are in this window:
- Right after your period (roughly Days 4 to 6): Discharge is dry or tacky, sticky, slightly damp and white.
- Mid-follicular (roughly Days 7 to 9): Creamy, yogurt-like consistency. Wet and cloudy.
- Late follicular, approaching ovulation (Days 10 to 14): Stretchy, slippery, and resembling raw egg whites. This is your most fertile mucus.
If your discharge is dry or barely there and your period just ended, you’re in the early follicular phase. If it’s getting wetter and more slippery, you’re approaching ovulation.
The Ovulation Phase (Around Day 14)
Ovulation is technically a brief event, not a long phase. It happens when estrogen peaks high enough to trigger a surge of luteinizing hormone (LH). About 36 to 40 hours after that LH surge, your ovary releases a mature egg. In a 28-day cycle, this usually falls around Day 14, but it can shift earlier or later depending on your cycle length.
Signs you’re ovulating or about to:
- Egg-white cervical mucus: Clear, stretchy, and very slippery. This is the most distinctive sign.
- Mild pelvic twinge: Some people feel a one-sided ache or cramp near an ovary, sometimes called mittelschmerz.
- Slight temperature rise: Your basal body temperature (the temperature you take first thing in the morning before getting out of bed) increases by 0.4°F to 1°F after ovulation. The catch is that this rise confirms ovulation already happened, so it’s useful for tracking patterns over several months rather than predicting the exact day in real time.
- Positive ovulation test strip: These detect the LH surge in your urine. Once the test turns positive, ovulation typically follows within 12 to 24 hours.
Ovulation generally occurs about 14 days before the start of your next period. If your cycles are 30 days long, that puts ovulation closer to Day 16. If they’re 26 days, it’s closer to Day 12.
The Luteal Phase (Days ~15 to 28)
After the egg is released, the empty follicle transforms into a structure called the corpus luteum, which pumps out progesterone. Progesterone’s job is to thicken and stabilize the uterine lining in case a fertilized egg needs to implant. This phase lasts roughly 10 to 16 days and is more consistent in length than the follicular phase.
Progesterone is responsible for most of the symptoms people associate with PMS. If you’re experiencing any of the following and your period is approaching, you’re likely in the luteal phase:
- Breast tenderness or swelling
- Bloating
- Mood changes, including irritability or feeling more emotional than usual
- Breakouts or acne
- Changes in appetite, especially cravings for carbs or sweets
Cervical mucus dries up noticeably after ovulation. If you had that slippery, egg-white mucus a week or so ago and now things feel drier or sticky again, that’s a strong signal you’ve crossed into the luteal phase. If no pregnancy occurs, progesterone and estrogen both drop sharply toward the end of this phase, and the cycle resets with your next period.
How to Figure Out Your Phase Right Now
Start by counting. Open a calendar and find the first day of your most recent period. That’s Day 1. Count forward to today. If you’re on Day 3, you’re in the menstrual phase. Day 10 with creamy or wet discharge? Late follicular, approaching ovulation. Day 20 with sore breasts and dry mucus? Luteal phase.
If you don’t remember when your last period started, your body still gives you clues. Active bleeding means menstrual phase. Increasingly wet, stretchy discharge means you’re nearing ovulation. Dry discharge plus PMS-like symptoms means luteal. Over the next few cycles, marking the start date of each period on a calendar or in a tracking app will help you see your personal pattern. After two or three months, you’ll have a reliable sense of your cycle length and can estimate your phase on any given day.
Keep in mind that not everyone runs on a textbook 28-day cycle. Cycles anywhere from 24 to 38 days are considered normal, and the follicular phase is the part that varies most. The luteal phase stays relatively stable. So if your cycles tend to run long, ovulation is probably happening later than Day 14, and your follicular phase is the stretch that’s extended.