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Longer answers to the questions people search for most, with the sources listed so that you can check them. Short on time? Try the period FAQ.

• 2 November 2026 · 6 min readCan stress delay your period? How it happens and how long it lastsStress is one of the most common reasons for a late period. How stress delays ovulation, how late a stress-delayed period can be, and when it's worth seeing a GP.
• 2 November 2026 · 5 min readYour first period: when it starts and what to expectMost girls start their periods at about 12, but anywhere from 8 is normal. The signs a first period is coming, what happens during a period, and when to see a GP.
• 2 November 2026 · 6 min readHow late can a period be before you should worry?A few days late is common. What about a week, 35 days or 2 months? What each delay usually means, when to take a test, and when to see a doctor.
• 2 November 2026 · 6 min readLate period but not pregnant? 9 reasons it happensA negative test and still no period? Stress, weight changes, exercise, contraception and PCOS are common reasons. Here's what to check, and when to see a GP.
• 2 November 2026 · 6 min readLate periods in your 40s. Is it perimenopause?Periods that come later, earlier or less predictably are often the first sign of perimenopause. What changes to expect, other symptoms, and when to see a GP.
• 2 November 2026 · 6 min readPCOS, now called PMOS, and late periodsPolyendocrine metabolic ovarian syndrome, which used to be called PCOS, is a common cause of late and irregular periods. The signs, how it's diagnosed and what helps.
• 2 November 2026 · 5 min readCan weight loss or exercise make your period late?Sudden weight loss, being overweight and exercising a lot can all delay or stop periods. Why it happens, the signs to watch for, and when to see a GP.
• 2 November 2026 · 5 min readWhat not to do during your period: 8 mistakes to avoidFrom leaving a tampon in too long to assuming you can't get pregnant, here are 8 common period mistakes, what to do instead, and the symptoms worth seeing a GP about.