Safe days when periods are irregular

The fertile window depends on ovulation, not simply the date bleeding begins. With irregular periods, ovulation may happen earlier, later, or not occur in a cycle. Sperm can remain able to fertilise an egg for several days, so a day that appears low-risk from a calendar may still carry pregnancy potential. Irregular bleeding can also be confused with a true period. Anovulation, Polycystic Ovary Syndrome, stress, illness, and changing hormones can all disturb timing.

If you want to avoid pregnancy, do not rely on predicted safe days alone. Discuss a method that fits your health, preferences, and relationship, such as condoms or a prescribed contraceptive method; the Combined Pill is one option for some people. If you want pregnancy, record bleeding and possible ovulation signs, but seek help if cycles remain difficult to interpret. A clinician can review medicines and symptoms and assess causes such as Polycystic Ovary Syndrome. Emergency contraception advice is time-sensitive after unprotected sex, so contact a pharmacy or clinician promptly.

Arrange an appointment if periods are repeatedly unpredictable, absent, unusually heavy, or accompanied by pelvic pain, new facial hair, nipple discharge, or hot flushes. Seek urgent assessment for severe pain, fainting, or heavy bleeding. If pregnancy is possible and a period is late, take a pregnancy test; urgent care is needed for pain or bleeding with a positive result.

Ask: Which contraceptive options suit me? How can I recognise ovulation? Could a health condition be disrupting my cycles? When should I test for pregnancy? What should I do after unprotected sex?