A period is usually still normal up to 6 days past the expected date; 7 or more days late is a practical working definition of “late”, derived from FIGO's regularity parameters. Enter your dates below to see exactly where you stand.
personal cycle forecast · Generated Predicted period days, fertile window and ovulation — based on your average cycle.
The direct answers: 1–3 days late = normal fluctuation, nothing to do. 4–6 days late = still inside the typical variation band. 7+ days late = test if pregnancy is possible. 90 days with no period = see a clinician. Everything below is the reasoning behind these four numbers.
Medicine has no official definition of a “late period” — it is not a diagnosis, not a fixed number of days, and not automatically a sign of pregnancy. On a calendar, late simply means today is past the date your average cycle predicted. The 7-day working threshold on this page comes from FIGO: a cycle counts as regular when the variation between your shortest and longest cycle over a year stays under 7–9 days.
| Days past expected | What it usually means | Suggested next step |
|---|---|---|
| 1–3 days | Normal fluctuation; ovulation likely shifted a few days | Nothing — wait |
| 4–6 days | Still inside the typical variation band | Wait; note stress, travel, illness |
| 7–13 days | Beyond the regularity band — a real “late” period | Pregnancy test if sexually active |
| 14+ days, negative test | Ovulation was likely much later than usual, or skipped | Retest in a week; track the next cycle |
| A full cycle passed, still nothing | That is the missed-period scale, not the days scale | Missed period calculator → |
Pregnancy needs sperm from this cycle. Without it, a late period points to ovulation timing, not conception.
One of the most reliable contraceptives that exists. A late period after one is far more likely stress or late ovulation than failure.
Over 99% effective. Hormonal IUDs also commonly lighten or pause periods entirely — that is expected, not a warning sign.
Bleeding on the pill is withdrawal bleeding set by the medication schedule — and tracking apps that assume a natural cycle will misreport you as “late.” A lighter or skipped withdrawal bleed can be normal; test if pills were missed or antibiotics were involved.
If that is you, the most likely explanation is almost boring: ovulation happened later than usual this cycle. Stress, illness, travel, hard training, and weight change all delay ovulation, and the period follows ovulation on its schedule — not yours.
Your cycle has two halves. The follicular phase (period start to ovulation) is the flexible half; the luteal phase (ovulation to next period) is comparatively stable — but not fixed: real-world data on 600,000+ cycles shows it typically ranges 10–15 days, not the textbook 14.
| Life stage | Normal cycle range | When “late” starts | When to check in with a clinician |
|---|---|---|---|
| Teens, first years after first period | 21–45 days | Past your longest usual cycle | Cycles regularly longer than 45 days, or 90+ days with no period |
| Adults with regular cycles | 24–38 days | 7+ days past expected date | 90+ days with no period; cycles persistently under 24 or over 38 days |
| Adults with irregular cycles | Varies by 7–9+ days cycle to cycle | Past your longest recorded cycle | New irregularity after years of stable cycles |
| Perimenopause (typically 40s) | Often lengthens or shortens unpredictably | Expect wide variation | Very heavy bleeding, bleeding between periods |
| After stopping hormonal birth control | Can take a few months to settle | Withdrawal-bleeding logic does not apply | No natural period within about 3 months of stopping |
| Scenario | Inputs | Result | Reading |
|---|---|---|---|
| Regular 28-day cycle | Last period = day 0; today = day 33 | 5 days past expected | Inside the variation band — no action needed |
| Irregular cycles (30–38 days) | Use the longest cycle (38) as the expected date; today = day 40 | 2 days past the longest cycle | For irregular cycles, “late” only starts past your longest recorded cycle |
| 10 days late, negative test, partner had a vasectomy | Last period = day 0; today = day 38 on a 28-day average | 10 days past expected, hCG negative | Most likely late ovulation this cycle; retest in a week for completeness, then track the next cycle |
The period still arrives, just after the expected date.
A pattern: shortest-to-longest spread beyond 7–9 days across a year.
Irregular period calculator →One-off vs pattern: one late cycle does not make you irregular. A new repeating pattern is what deserves a closer look.
Take a home pregnancy test — most are reliable from the first day of a missed period (NHS), most accurate about a week after.
Usually late ovulation, not a faulty test. Repeat the test after another week.
Next questions are timing: pregnancy test calculator for testing detail, due date calculator for the estimate.
See a clinician if your cycles are persistently shorter than 24 or longer than 38 days, or a late period comes with severe pain, dizziness, or unusual bleeding. And if your period never arrives at all — a full cycle with no bleeding — that is the missed-period territory: the escalation path and the 90-day secondary amenorrhea line live on the missed period calculator.
The math is simple: expected next period = first day of last period + your average cycle length, then compare with today. In irregular mode we compare against your longest cycle, so you are only called late when even your longest usual cycle has passed.
The estimate assumes a 14-day luteal phase, but real luteal phases vary 10–15 days, and even regular cycles shift by a few days. Treat every output as a window, not a fixed date. The full formulas and sources are on the methodology page.
Pick the first day of your most recent period — the day full bleeding started, not spotting.
Not sure? Use the built-in helper: enter a few past start dates and we compute your personal average.
Next period date, ovulation day, fertile window and a 6-month forecast — plus a heads-up if you're running late.
When your period actually starts, come back and tap "Log this period". After two or three logs we learn your real cycle length — not the textbook 28 days — and your predictions start using it.
No. A 1–2 day shift is well inside normal variation — FIGO counts cycles as regular when they vary by less than 7–9 days across a year. There is nothing to check or do.
Almost always, yes. Ovulation shifting by a few days (stress, travel, a bad sleep week) moves the whole cycle back by the same amount. Around 7 days late is the point where testing becomes sensible if pregnancy is possible.
There is no universal maximum — but there is a useful personal one: your own longest recorded cycle. Within your normal range, a late period is variation. Past it, take a test if there is any chance of pregnancy; at 90 days with no period, see a clinician regardless.
Most likely late ovulation this cycle — stress, illness, travel, training, or weight change delay ovulation, and the period follows. Less commonly: PCOS or thyroid patterns, perimenopause, or the months after stopping hormonal birth control. A vasectomy, IUD or pills on schedule make pregnancy very unlikely; one late cycle after an unusual month is far more likely to be one of the causes above.
Most home tests are reliable from the first day of a missed period (NHS) and most accurate about 7 days after. Negative but still no period? Repeat in a week.
Usually late ovulation — the luteal phase runs 10–15 days rather than a fixed 14, so your period may not actually be due yet. Testing too early also gives false negatives; retest in a week. If a full cycle passes with no period at all, the missed period calculator covers that scenario in detail.
Yes. Stress hormones can postpone or suppress ovulation, which pushes the whole cycle back day-for-day. A stressful month commonly shows up as a late period a few weeks later.
Late means it arrives after the expected date; missed means a full cycle passed with no bleeding. 90 days without a period is secondary amenorrhea — see a clinician. More on the missed period page.
A one-off late cycle after an unusual month: almost never. A new pattern — cycles suddenly much longer, much more variable, or repeatedly absent — is worth a clinician conversation, especially with other changes like acne, excess hair growth, or fatigue.
Bleeding on hormonal birth control is withdrawal bleeding, driven by the pill schedule — not by your own cycle, so period calculators don't apply (and apps that assume a natural cycle will wrongly call you “late”). A lighter or skipped withdrawal bleed can be normal; test if pills were missed, or if antibiotics or illness were involved. Persistent absence: see a clinician.
Cycles persistently under 24 or over 38 days, or a late period with severe pain, dizziness, or unusual bleeding. If a full cycle passes with nothing at all, that is missed-period territory — thresholds and escalation live on the missed period page.
It happens — and it almost always means ovulation ran very late or was skipped this cycle, not something sinister. The luteal phase after ovulation stays in a 10–15 day band, so a period 2–3 weeks late usually means ovulation itself shifted by that much (stress, illness, travel, coming off birth control). With a negative test and no other symptoms, the protocol is wait and retest weekly; once a full cycle has passed with no bleeding, the missed period calculator takes over — and 90 days with no period is the see-a-clinician line regardless.
Yes. Emergency contraception works partly by delaying ovulation, so the period that follows can arrive earlier or later — Mayo Clinic notes a delay of up to about a week. If your period has not come within 3 weeks of taking it, take a pregnancy test. More detail in our guide to why periods run late.
There is no proven home method — and be skeptical of any “remedy” that claims otherwise. A period arrives on ovulation's schedule: bleeding follows about two weeks after the egg releases, so until the body ovulates, nothing you eat, drink or do changes the date. What you can do is remove what delayed ovulation (a brutal stress month, hard training, travel) so the next cycle resets sooner — and wait. If a full cycle passes with nothing, that is missed-period territory; and if waiting becomes the pattern, a clinician visit is genuinely useful: Cleveland Clinic notes amenorrhea is often a sign of a treatable condition, with real treatment options — not something home remedies can touch.
Almost always, yes. Postpartum cycles run irregular while they settle — WebMD's medically reviewed guidance is explicit that one returning period does not mean your cycles are back, and exclusive breastfeeding often holds periods off entirely (NHS). The one thing to rule out: fertility returns as early as 3 weeks after birth, even while breastfeeding and before any period (NHS) — so if pregnancy is possible, test. The full picture is in our guide to the first period after birth.