Irregular periods and effects on pregnancy

The fertile window depends on ovulation, so a changing cycle can make it difficult to know when conception is most likely. Some irregular cycles happen because ovulation is occasional or absent, a pattern called Anovulation. Polycystic Ovary Syndrome and thyroid or other hormone changes may also affect cycle timing. Irregular bleeding is not a diagnosis of infertility, and a pregnancy can occur even when periods are difficult to predict.

If you are trying to conceive, record bleeding dates, cycle symptoms and any ovulation tests, while having sex regularly rather than relying on a predicted day. Arrange a gynaecology review if cycles remain widely spaced or conception is taking longer than expected. A clinician may review medicines, medical history and hormone patterns, and discuss options such as Metformin for PCOS when that condition is relevant.

Seek prompt medical advice for severe pelvic pain, fainting, shoulder-tip pain, or bleeding during a possible pregnancy. Make an appointment for repeated missed periods, new cycle changes, or bleeding between periods, because these patterns deserve assessment even when pregnancy is not the concern.

Ask whether your pattern suggests irregular ovulation, which pregnancy test timing is sensible for your cycle, and whether testing for Polycystic Ovary Syndrome, Premature Ovarian Insufficiency or other causes is appropriate.