Brown discharge in early pregnancy: what it usually means

Why it happens

Brown means old — blood that has taken time to leave the body and has oxidised on the way. Fresh bleeding is red; brown is usually something that happened hours or days ago.

Common harmless causes in the first trimester: implantation bleeding around the time a period was due, a small amount of cervical bleeding after sex or an internal examination (the cervix is more vascular in pregnancy and bleeds easily), and the tail end of an earlier episode of spotting.

Around one woman in four has some bleeding in the first trimester and goes on to have a completely normal pregnancy. That statistic is worth holding on to while you wait to be seen.

The causes that need attention

Subchorionic haematoma: a collection of blood between the pregnancy sac and the uterine wall, seen on scan, which often resolves on its own but needs monitoring.

Threatened or actual miscarriage: usually with cramping and progressing to red bleeding. Bleeding alone does not mean miscarriage, and it does need assessment.

Ectopic pregnancy: a pregnancy outside the uterus, which is a medical emergency. The pattern to know is one-sided abdominal pain with bleeding, sometimes shoulder-tip pain, dizziness or fainting.

Infection of the vagina or cervix, which can cause discharge with an odour, itching or burning and needs treating.

And in later pregnancy, brown or red discharge can signal placental problems or, near term, the mucus plug coming away.

What to do

Note what you are seeing: colour, quantity, whether it is increasing, whether there is pain, and how many pads. Your doctor will ask all of that.

Use a pad rather than a tampon, avoid sex until you have been assessed, and rest — though bed rest itself does not prevent miscarriage and is not usually prescribed.

Call your obstetrician the same day for any bleeding in pregnancy, even brown and light. Most of the time you will be reassured, often with a scan; that is the correct use of the phone call.

A scan will check the pregnancy's location, the heartbeat where the dates allow, and whether there is a haematoma. Blood tests may include hCG levels and your blood group — Rh-negative women need an anti-D injection after significant bleeding.

When to see a doctor

Go to hospital immediately at any stage for: heavy bleeding, severe or constant abdominal pain, a gush or steady trickle of fluid, severe headache with visual changes, sudden swelling of the face and hands, high fever, fainting, or reduced fetal movements after 28 weeks. Call 108 if you cannot travel quickly.

Same-day for brown discharge specifically: any bleeding at all in pregnancy warrants a call. Go immediately if it becomes red and heavy, if there is one-sided pain, dizziness, shoulder-tip pain or fainting, if there is fever, or if the discharge smells offensive.

This article is general information, not medical advice, and is no substitute for personal medical advice. For any decision about your or your child's health, please consult your doctor.

Frequently asked questions

Q: I had brown spotting for two days and it stopped. Do I still need to tell my doctor? — Yes, mention it at the next visit even if it settled. It usually changes nothing and occasionally it changes the monitoring.

Q: Can stress cause spotting? — Not directly. Do not accept stress as an explanation before the pregnancy has been assessed.

Q: Is it safe to travel with spotting? — Ask your doctor. Light brown spotting that has been assessed is usually fine; unassessed bleeding is a reason to be seen before travelling.

Q: I am Rh-negative. Does bleeding matter more? — Yes. Tell the doctor immediately, since an anti-D injection may be needed to protect future pregnancies.