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OB-GYN PHARMAWomen & Families
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Women & Families

Late or missing periods

Pregnancy, stress, contraception and hormonal conditions can affect periods. A calendar cannot tell which cause applies.

A guide to understand and prepare

When to seek care

Arrange review if periods have not started by 15, or you miss three in a row. Seek earlier advice for concerning symptoms.

Urgent-help guide
Understand the concern

Pregnancy is one possibility. Breastfeeding, contraception, weight changes, intense exercise, thyroid conditions and ovarian hormone conditions can also change periods.

What assessment may involve

Bring cycle dates and medicine details. A clinician may arrange hormone blood tests or further assessment depending on your history.

Care options to discuss

Treatment depends on the cause. A prescription used to change bleeding does not by itself explain why periods stopped.

These are discussion points, not a prescription. Suitability and availability vary.

Practical next steps

Write down your last period and recent changes in contraception, breastfeeding, stress, exercise, weight or health. If pregnancy is possible, follow the instructions on a pregnancy test. A late period alone cannot tell you whether the cause is pregnancy, hormones or another condition.

Follow-up and decisions

Arrange assessment after three missed periods, or earlier if there are other concerns. Take previous test results and medicine details. Ask what the proposed blood tests look for and when to review. Severe pain or faintness with possible pregnancy needs urgent care, not a routine appointment.

A question you may have

Can the cycle calculator diagnose the cause?

No. It measures dates; it does not assess pregnancy or hormones.

Prepare for your appointment

What to record

Record dates, contraception and other changes. Consider a pregnancy test if pregnancy is possible.

Questions worth asking

  • Which possible causes fit my history?

  • Which tests would change the next step?

About this information
Editorial update
4 October 2026
Clinical reviewer
Not assigned — approval pending
Arabic language review
Pending
Next editorial review target
4 January 2027 · earlier for reported errors
Country applicability
General education. No country edition has been clinically approved.

Sources are linked below each guide. Publication is not clinical approval. Updates and corrections require another content review.

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