Getting pregnant with irregular periods

Irregular bleeding may happen when ovulation is late, does not happen in a cycle, or varies from month to month. Without ovulation, an egg is not released for sperm to fertilise. A symptom page on [Irregular Periods](/symptoms/irregular-periods/) can help you describe changes in bleeding pattern, cycle spacing and flow.

Possible contributors include polycystic ovary syndrome, changes around perimenopause, premature ovarian insufficiency, thyroid or other hormone changes, shifts in weight, intense exercise and some medicines. Irregular periods do not identify one cause by themselves. [Polycystic Ovary Syndrome](/conditions/polycystic-ovary-syndrome/) and [Anovulation](/conditions/anovulation/) are examples of conditions that may affect ovulation.

Have sex regularly through the cycle rather than relying only on a predicted ovulation date. Record bleeding dates, cervical mucus changes, ovulation-test results and symptoms; these details can show whether a pattern is emerging. Home ovulation tests may be harder to interpret when hormone patterns are irregular, so discuss confusing or repeatedly negative results with a clinician.

Arrange a fertility-focused appointment if cycles are widely spaced, absent, or difficult to track. Assessment may include a health history, blood tests and an ultrasound, depending on your symptoms. Treatment depends on the cause and your pregnancy goals. For example, [Metformin for PCOS](/treatments/medical-gynaecology/metformin-for-pcos/) may be discussed in some people with PCOS; it is not suitable for everyone.

Seek an appointment if your periods have become irregular, stop for several months, or you have been trying to conceive without success. Seek prompt medical help for very heavy bleeding, severe pelvic pain, fainting, or bleeding during a possible pregnancy. A clinician can check for causes that need treatment and help you choose safe next steps.

Ask what may be disrupting ovulation, whether tests could clarify the cause, how to track fertile days with your cycle pattern, and when fertility treatment should be considered. Tell the clinician about medicines, supplements, previous pregnancies, pelvic symptoms and any family history of early menopause.