Irregular bleeding on the pill: what to know

Spotting or bleeding between expected withdrawal bleeds is common after starting, changing, or restarting a pill. Taking tablets late, missing doses, vomiting, diarrhoea, or using some medicines can reduce contraceptive protection and contribute to bleeding. The pattern may also reflect the underlying reason for taking the pill, such as irregular ovulation. Anovulation, polycystic ovary syndrome, perimenopause, and premature ovarian insufficiency can each be associated with irregular periods; the bleeding symptom alone does not identify one cause.

Bleeding after sex, unusual discharge, pelvic pain, or bleeding that continues despite taking tablets correctly should be assessed. A pregnancy test may be appropriate if pills were missed, started late, or protection may have been reduced.

Record the days you take tablets, the timing and amount of bleeding, missed or late doses, pain, and any new medicines. Follow the instructions for your specific pill and do not stop it suddenly without advice if pregnancy prevention matters to you. If a dose was missed or vomiting affected absorption, check the pack leaflet or contact a pharmacist promptly about additional contraception.

A clinician can review whether a combined pill remains suitable, check for pregnancy or infection when indicated, and discuss another approach if the bleeding is difficult to manage.

Seek urgent help for very heavy bleeding with dizziness or faintness, severe or one-sided pelvic pain, shoulder-tip pain, or bleeding with a positive pregnancy test. Arrange prompt medical review for bleeding after sex, fever, foul-smelling discharge, new pelvic pain, or bleeding that is persistent, recurrent, or affecting daily life. These warning signs need assessment because they can point to pregnancy-related or pelvic problems rather than a simple pill adjustment.

Ask whether your bleeding pattern fits your pill, whether you need a pregnancy or infection test, how to handle missed tablets, and whether a different formulation or the Combined Pill may be appropriate. If you have symptoms of PCOS, ask whether evaluation or Metformin for PCOS is relevant.