Normal pregnancy discharge is thin, clear or milky white, and has only a mild smell. Called leukorrhea, this discharge increases throughout pregnancy due to rising hormone levels and greater blood flow to the pelvic area. It’s one of the earliest and most persistent changes your body goes through, and in most cases it’s completely harmless.
What Leukorrhea Looks and Feels Like
Leukorrhea is the medical term for the normal vaginal discharge that picks up during pregnancy. It’s thin in consistency, clear to milky white in color, and either odorless or very mildly scented. You might notice it on your underwear or when you wipe, and it can range from barely noticeable to enough that you want to wear a panty liner.
This discharge serves a real purpose. It helps keep the vaginal canal clean and maintain a healthy balance of bacteria, which protects both you and the pregnancy from infection. The volume tends to increase as your pregnancy progresses, especially in the third trimester, because estrogen levels keep climbing and blood flow to the cervix and vaginal walls continues to rise. A gradual increase in the amount of discharge is normal and expected.
How Discharge Changes in Late Pregnancy
As you approach your due date, you may notice discharge that looks different from what you’ve been seeing for months. One common change is the loss of the mucus plug, which is a thick collection of mucus that seals the cervical opening during pregnancy. It’s clear, off-white, or slightly tinged with pink, red, or brown. The texture is stringy, sticky, and jelly-like, and it’s typically about 1 to 2 tablespoons in volume.
Most women lose their mucus plug after 37 weeks. It can come out all at once or in smaller pieces over several days. Losing it doesn’t mean labor is imminent. Some women go into labor within hours, while others don’t for several more weeks. Some don’t lose it until they’re already in active labor. On its own, losing the mucus plug is not a cause for concern at full term.
Discharge vs. Amniotic Fluid
One thing that catches many pregnant women off guard is a sudden gush or persistent trickle of fluid that doesn’t feel like normal discharge. This could be amniotic fluid, and it’s worth knowing the difference.
Normal discharge is typically thicker in consistency and stays in your underwear without continuing to flow. Amniotic fluid, on the other hand, is clear or pale yellow, very watery, and tends to come as either a sudden gush or a slow, persistent leak that doesn’t stop when you change positions. If fluid seems to come out during a contraction (when your uterus tightens), that’s a strong signal your water has broken. A slow trickle that keeps going, even when you’re not moving, is another hallmark. If you’re unsure whether what you’re experiencing is discharge or a fluid leak, it’s worth getting checked.
Colors That Signal a Problem
The color and smell of your discharge are the most reliable clues that something may be off. Yellow, green, or gray discharge can point to a bacterial infection or a sexually transmitted infection. A strong or fishy odor is another warning sign, regardless of color.
Here’s what specific changes can indicate:
- White or gray with a fishy smell: Bacterial vaginosis (BV), caused by an overgrowth of certain bacteria in the vagina. BV is common in pregnancy, affecting anywhere from 12% to 49% of pregnant women worldwide depending on the population studied. It’s not just a nuisance. Untreated BV is linked to roughly double the risk of premature rupture of membranes and nearly double the risk of preterm birth and low birth weight.
- Green, yellow, or frothy: Trichomoniasis, a sexually transmitted infection that can also make discharge look bubbly or foamy.
- Cloudy yellow or green: Gonorrhea or chlamydia, both of which can be present without other obvious symptoms.
- Thick, white, and clumpy: A yeast infection, which is more common during pregnancy due to hormonal shifts. The hallmark symptoms are intense itching and burning of the vulva, sometimes with a change in discharge texture that resembles cottage cheese.
BV and Yeast Infections Feel Different
Because bacterial vaginosis and yeast infections are the two most common vaginal infections during pregnancy, it helps to know how to tell them apart. BV tends to produce a thin, grayish-white discharge with a noticeable fishy odor that often gets stronger after sex. Itching may or may not be present. A yeast infection, by contrast, causes thick, white, lumpy discharge with significant itching and burning around the vulva. The smell is usually mild or absent.
Both are treatable during pregnancy, and both are worth addressing. BV in particular carries real risks for the pregnancy if left untreated. A large meta-analysis found that BV was associated with a 76% higher likelihood of preterm birth and a 73% higher likelihood of low birth weight. It was also linked to more than double the risk of miscarriage and intrauterine infection. These aren’t reasons to panic, but they are reasons to mention any changes in your discharge to your provider sooner rather than later.
Red Flags That Need Prompt Attention
The CDC lists several discharge-related warning signs during pregnancy that warrant immediate contact with a healthcare provider:
- Vaginal bleeding beyond light spotting: Anything that resembles a period in volume.
- Fluid leaking from the vagina: Especially a persistent trickle or gush before 37 weeks, which could indicate preterm rupture of membranes.
- Foul-smelling discharge: A strong or unpleasant odor at any point during pregnancy.
Light spotting can happen during pregnancy for benign reasons, particularly in the first trimester. But heavier bleeding, fluid that keeps coming, or discharge with an unmistakable bad smell are situations where speed matters. These symptoms can signal infections, placental problems, or premature changes in the cervix that benefit from early intervention.
Keeping Track of What’s Normal for You
Every woman’s baseline is a little different. Some women produce more discharge than others even before pregnancy, and those differences carry over. The most useful thing you can do is pay attention to your own pattern early on so that changes stand out. If your discharge has always been clear and mild and suddenly turns yellowish with an odor, that shift is meaningful even if the amount hasn’t changed.
Wearing a panty liner can make it easier to monitor color and consistency. Avoid douching or using scented products in the vaginal area, as these can disrupt the bacterial balance that your body is working hard to maintain. Cotton underwear and breathable fabrics also help keep the environment stable. The discharge itself, as inconvenient as it can feel, is doing exactly what it’s supposed to do.