Green discharge during pregnancy is not normal. Healthy pregnancy discharge is thin, clear or milky white, and has no unpleasant smell. When discharge turns green, it typically signals an infection that needs treatment.
Pregnancy naturally increases vaginal discharge, a condition called leukorrhea, so noticing more fluid than usual is expected. But the color matters. Green is a flag that something beyond normal hormonal changes is going on.
What Healthy Pregnancy Discharge Looks Like
Throughout pregnancy, rising estrogen levels and increased blood flow to the pelvic area cause the vagina to produce more discharge than usual. This is the body’s way of keeping the birth canal clean and preventing infections from traveling upward. Normal discharge is thin, clear or milky white, and either odorless or very mild in smell. It may leave a slight yellowish tint on underwear after drying, which is also normal.
The volume tends to increase as pregnancy progresses, especially in the third trimester. As long as the discharge stays within that clear-to-white range and doesn’t smell bad, there’s generally nothing to worry about.
Why Discharge Turns Green
Green vaginal discharge is considered a sign of infection. The most common causes are sexually transmitted infections: trichomoniasis, chlamydia, and gonorrhea. Each of these can produce discharge that ranges from yellowish-green to distinctly green, often with a noticeable odor.
Trichomoniasis
Trichomoniasis (often called “trich”) is one of the most common culprits behind green discharge. It’s caused by a parasite and produces a thin, sometimes frothy discharge that can be green or yellowish-green with a fishy smell. Other symptoms include genital redness, burning or itching, discomfort when urinating, and pain during sex. Some people have very mild symptoms or none at all, which means the infection can go unnoticed for weeks.
Trichomoniasis during pregnancy carries real risks. It increases the chance of preterm delivery and of the baby being born at a low birth weight (under 5.5 pounds). The infection can also be passed to the baby during delivery. Treatment is available and generally considered safe during pregnancy, though you’ll want to discuss timing and options with your provider. About 20 percent of people who are treated for trich get reinfected within three months, so partners need treatment too.
Chlamydia and Gonorrhea
Both chlamydia and gonorrhea can cause abnormal discharge that looks yellow or greenish. Chlamydia is frequently silent, meaning many people have no symptoms at all. When symptoms do appear, they may include unusual discharge and discomfort while urinating. Routine screening is recommended for pregnant people under 25, or older if risk factors are present. Gonorrhea shares similar symptoms and is also tested for during prenatal care.
Left untreated, either infection can lead to serious complications. In pregnancy, they raise the risk of preterm birth, low birth weight, and transmission to the baby during delivery. Both are treatable with antibiotics that are safe to use during pregnancy.
Green Fluid vs. Green Discharge
Later in pregnancy, especially near or past your due date, it’s important to distinguish between vaginal discharge and leaking amniotic fluid. Amniotic fluid that looks brown or green can mean the baby has passed meconium (their first stool) into the fluid. This is a different situation from an infection and can cause breathing complications if the baby inhales it.
Amniotic fluid tends to be thinner and more watery than discharge, and it often comes in a slow, steady trickle that’s hard to control, unlike urine. If you notice greenish fluid that seems watery and continuous rather than thick or mucus-like, contact your provider right away. Vaginal bleeding or fluid leaking during pregnancy is listed among the warning signs that call for immediate medical attention.
How Infections Are Diagnosed
When you report green or unusual discharge, your provider will likely collect a vaginal swab. Several tests can be run on that sample. A wet mount involves placing the fluid on a glass slide and examining it under a microscope for bacteria, white blood cells, or “clue cells,” which are vaginal wall cells with fuzzy borders that indicate bacterial infection. Your provider may also check vaginal pH. A healthy vagina sits between 3.8 and 4.5 on the pH scale; anything above 4.5 suggests the environment has shifted in a way that favors infection.
For sexually transmitted infections, rapid antigen tests and nucleic acid amplification tests have largely replaced older culture-based methods. These newer tests are faster and more accurate. Results often come back within a day or two, so treatment can start quickly.
What Treatment Looks Like
Most infections that cause green discharge are treated with oral antibiotics. For trichomoniasis specifically, the standard medications are considered usable during pregnancy, though your provider will weigh the timing based on your trimester and overall health. Treatment for chlamydia and gonorrhea also involves pregnancy-safe antibiotics, typically a short course.
The key is that these infections don’t resolve on their own, and waiting carries risks. Untreated infections during pregnancy can lead to preterm birth, low birth weight, birth defects, and in some cases lifelong disabilities for the baby like hearing loss. Sexual partners need to be treated at the same time to prevent reinfection.
Signs That Need Prompt Attention
Green discharge on its own warrants a call to your provider, but certain combinations of symptoms should move up the timeline. A fever of 100.4°F or higher alongside unusual discharge could indicate the infection is spreading. Severe belly pain that doesn’t go away, fluid that seems to be leaking continuously, or a foul smell coming from the fluid are all reasons to be seen urgently rather than waiting for your next scheduled appointment.
If you’re unsure whether what you’re seeing is discharge, urine, or amniotic fluid, check your underwear for color and smell. Urine has a distinct odor and is easier to control with pelvic muscles. Amniotic fluid is typically odorless or mildly sweet, thin, and hard to stop. Discharge tends to be thicker and collects in smaller amounts. When in doubt, get it checked. A simple exam can tell the difference and either put your mind at ease or start treatment before complications develop.