Brown spotting after sex during pregnancy: what to know

Brown blood has usually taken longer to leave the vagina than bright-red blood. During pregnancy, increased blood flow can make the cervix easier to irritate, so sex or an examination may be followed by a small amount of spotting. Vaginal or cervical infection can also cause bleeding after sex, especially with unusual discharge, odour, itching, burning when urinating, or pelvic discomfort; Chlamydia is one condition a clinician may consider.

Spotting can happen for reasons that are not dangerous, but bleeding may also accompany problems involving the pregnancy or cervix. A symptom page on [Bleeding Between Periods](/symptoms/bleeding-between-periods/) explains the broader pattern outside pregnancy. Conditions such as cervical dysplasia, cervical cancer, polyps, or fibroids are less common possibilities that require an examination rather than self-diagnosis.

Note when the spotting started, how much you saw, whether it was brown or red, and whether it followed sex. Use a pad or liner so you can observe the amount; avoid inserting anything into the vagina until a clinician advises you. Contact your obstetric or maternity team and tell them how many weeks pregnant you are, whether you have pain, and whether the bleeding is continuing. They may ask about your pregnancy history and arrange an examination, infection testing, or an ultrasound when appropriate.

Seek urgent medical help if bleeding becomes heavy, turns bright red, contains clots or tissue, or comes with worsening abdominal or pelvic pain. Get emergency help for severe one-sided pain, shoulder-tip pain, fainting, marked dizziness, weakness, fever, or feeling very unwell. These signs can signal a complication that needs rapid assessment. Even without these symptoms, contact your maternity team promptly if spotting returns, lasts, or worries you.

Ask: Could the cervix or an infection explain this bleeding? Do I need an examination, infection test, or ultrasound? Should I pause sex or other vaginal activities for now? Which changes should make me call again immediately? If you have a known cervical or womb condition, mention it and ask whether it changes the plan.