Your menstrual cycle day by day (day 1 to 28 and beyond)
Day 1 is the first day of real bleeding. Days 1 to 5 are usually your period; days 6 to about 13 are the follicular phase, with estrogen and energy rising; ovulation often falls around days 12 to 16 in a 28-day cycle; and days 15 to 28 are the luteal phase, with progesterone rising, then falling before your next period. Longer cycles stretch the days before ovulation.
How to read this day-by-day guide
This guide uses a 28-day example cycle with ovulation around day 14. Real cycles vary: in a study of over 600,000 cycles, the average was 29.3 days and only a minority were exactly 28. If your cycle is longer, add the extra days before ovulation. The days after ovulation (the luteal phase) stay closer to 12 to 14 for most people. Our what phase am I in tool adjusts this for your own cycle.
Days 1 to 5: your period
| Day | Body and hormones | How many people feel |
|---|---|---|
| Day 1 | First day of real bleeding. Estrogen and progesterone at their lowest; prostaglandins high | Cramps, tired, relief that PMS is lifting |
| Day 2 | Often the heaviest flow. FSH rising to wake up new follicles | Lowest energy for many; cozy and inward |
| Day 3 | Flow easing for many | Cramps settling, mood lifting |
| Day 4 to 5 | Light flow or spotting; estrogen starting to rise | Energy returning |
More in the menstrual phase guide. A period of 2 to 7 days is normal.
Days 6 to 12: follicular phase
| Day | Body and hormones | How many people feel |
|---|---|---|
| Day 6 to 7 | A dominant follicle emerges; estrogen climbing; lining rebuilding | Lighter, more optimistic |
| Day 8 to 10 | Estrogen rising steadily; discharge dry or sticky, then creamy | Steady energy, good focus, clearer skin |
| Day 11 to 12 | Estrogen high; discharge getting wetter; fertile window opening | Confident, social, rising libido |
Days 13 to 15: ovulation
| Day | Body and hormones | How many people feel |
|---|---|---|
| Day 13 | Estrogen peaks; LH surge begins; clear, stretchy discharge | Often the most energetic, flirty days |
| Day 14 | Ovulation around now in this example: egg released 24 to 36 hours after the LH surge starts | Some feel a one-sided twinge; libido often peaks |
| Day 15 | Egg lives up to 24 hours; progesterone starts rising; temperature begins to climb | A short dip for some as estrogen drops |
Cycle day 14 is only ovulation day for some people. NHS guidance places ovulation about 12 to 16 days before your next period. See the ovulation phase guide.
Days 16 to 28: luteal phase
| Day | Body and hormones | How many people feel |
|---|---|---|
| Day 16 to 19 | Progesterone rising; body temperature up about 0.3 to 0.5 掳C | Calm, steady, a bit sleepier |
| Day 20 to 22 | Progesterone peaks; estrogen has a second rise; implantation window | Hungrier, sometimes sore breasts |
| Day 23 to 25 | Corpus luteum fading; hormones start to fall | PMS often begins: irritability, cravings, bloating |
| Day 26 to 28 | Estrogen and progesterone falling fast | PMS peaks for many: tearful, anxious, tired, breakouts |
Cycle day 21 is around the progesterone peak in a 28-day cycle, which is why doctors sometimes order a day 21 progesterone test to check ovulation. In longer cycles it's timed 7 days before the expected period instead. See the luteal phase guide.
Days 29 and beyond
Cycles of 21 to 35 days are normal in adults. If your cycle is longer than 28 days, ovulation simply came later, so the follicular days stretch. If your period is later than usual and you could be pregnant, take a test: from the first day of a missed period is most reliable. If you're not pregnant, stress, illness or travel are common reasons for a late cycle.
Every cycle is a little different. Lulu shows your cycle day and phase every day, and after a couple of cycles of one-tap check-ins, it shows how you usually feel on each day, like day 24: usually tired and a bit tender.
Mood day by day: a reminder
The mood column above is what many people report, not what you should feel. Research tracking daily mood finds large differences between people, and stress, sleep and life events matter as much as hormones. Your own pattern, built from your own check-ins, is far more useful than any chart. See mood by cycle phase.
See a doctor if your cycles are regularly shorter than 21 or longer than 35 days, if you bleed between periods or after sex, if your period lasts more than 7 days or is very heavy, if your periods stop for 3 months or more, or if premenstrual symptoms disrupt work, school or relationships.
Frequently asked questions
What happens on cycle day 14?
In a 28-day cycle, ovulation often happens around day 14, after an LH surge. In longer or shorter cycles, it shifts: it's usually 12 to 16 days before your next period.
What happens on cycle day 21?
In a 28-day cycle, day 21 is around the progesterone peak, about a week after ovulation. It's also when implantation would happen if an egg was fertilized.
What is cycle day 1?
The first day of real bleeding that needs a pad, tampon, cup or period underwear. Spotting before that counts as the previous cycle.
When does PMS start in the cycle?
Usually 5 to 10 days before your period, around days 18 to 25 in a 28-day cycle, easing within a few days of bleeding starting.
Sources
- Bull JR et al. Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles. npj Digital Medicine (2019)
- NHS: Periods
- Cleveland Clinic: Menstrual Cycle (Normal Menstruation): Overview & Phases
- Office on Women's Health: Premenstrual syndrome (PMS)
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
Keep reading
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