Dark Brown Spotting in the First Trimester

Spotting is lighter than a period, and brown blood has often remained in the vagina longer before coming out. The cervix may bleed more easily during pregnancy, including after sex or an examination. Hormonal changes, an infection, or a pregnancy complication can also cause bleeding; appearance alone cannot identify which explanation applies.

If pregnancy dates are uncertain, a clinician may use your menstrual history, examination, repeat pregnancy hormone measurements, or ultrasound to build a clearer picture. Conditions such as chlamydia can inflame the cervix. Cervical dysplasia and cervical cancer are not diagnosed from spotting colour, so persistent symptoms should be assessed rather than interpreted at home.

Call your maternity service or clinician and explain when the spotting started, whether it is changing, and whether you have cramps, one-sided pain, clots, discharge, or fever. Wear a pad or liner so you can observe the amount. Rest if you feel unwell, avoid internal vaginal products, and follow the advice given by your care team. Keep any appointment even if the spotting stops.

Seek emergency help if bleeding becomes heavy, or if you develop severe abdominal pain, one-sided pelvic pain, shoulder-tip pain, fainting, dizziness, weakness, fever, or confusion. Prompt assessment is also appropriate when spotting keeps returning or is paired with worsening cramps. The first trimester is a reason to seek tailored advice, not a reason to assume the worst from a brown colour.

Ask: How should I monitor the bleeding? Do I need an examination, infection test, blood test, or ultrasound? Could my dates be uncertain? Which pain or bleeding changes require emergency care, and whom should I contact outside clinic hours?