Why is my period late if I am not pregnant?
When you are not pregnant, a late period usually means your cycle is responding to something in your life. Stress, sudden weight change, intense exercise, travel across time zones, illness, and poor sleep can each delay ovulation, which delays everything after it.
Recurring lateness has findable causes: PCOS, thyroid problems and high prolactin are the usual three, all diagnosable with simple blood tests.
One late period after a stressful month is rarely alarming. Three irregular cycles in a row, or a missed period beyond six weeks with negative tests, is the point to book a visit.
Source: NHS, missed or late periods
See a doctor promptly if
- Bleeding between periods, after sex, or any bleeding at all after the menopause
- Soaking through protection hourly, passing very large clots, or feeling faint, breathless or dizzy with bleeding
- Sudden severe one-sided pelvic pain, especially with a late or missed period. This needs emergency assessment
- Pelvic pain with fever, foul-smelling discharge or feeling generally unwell
- No periods for three months or more when you are not pregnant, breastfeeding, or on a method that stops bleeding
- New heavy or irregular bleeding starting after the age of 45, or any change in a long-established pattern
How late is late?
| Result | In short | What it means |
|---|---|---|
| 1 to 4 days | Not late | Inside ordinary variation for almost everyone. Cycle length moves by a few days on its own, month to month. |
| 5 to 7 days | Officially late | This is the usual definition of a late period. Worth a pregnancy test if there is any chance, because a test is more reliable than the calendar. |
| 1 to 2 weeks | Common, still worth testing | Stress, illness, travel, a change in training load or in weight can each delay a cycle this much. Test first, then look at what changed. |
| 6 weeks | A missed period | Six weeks from the last period is the point where one cycle has been missed outright. If tests are negative, this is the stage to see a doctor. |
| 3 months, no periods | See a doctor | Three missed cycles has a name, amenorrhoea, and it is worth proper assessment: thyroid, prolactin, PCOS and low energy availability are the common findings. |
| Never started by 15 | See a doctor | A first period that has not arrived by fifteen, or within three years of breasts developing, should be looked at rather than waited out. |
Count from the first day of your last period. If there is any chance of pregnancy, test first and read the rest of this afterward. Check it against the guidelines.
Try the cycle tracker30 seconds, free, nothing to installCycle day, the next one and the fertile window, kept on your own device.
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Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
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